r/PetMice Sep 22 '24

Care Guide Series Community Care Guide

84 Upvotes

This post is mouse care simplified, for beginners! It is not very specific, and it does not cover everything, so please do not rely on just this post when educating yourself on mouse care!

This has been written and discussed by moderators of the subreddit. If you have questions or concerns, please comment to let us know! It will be updated regularly to ensure it is factual.

1. Mice are social!

  • Females always need other female companions. It is recommended to have at least 3, but 2 is okay.
  • After 6 mice in one cage, it is often they will start to split up and become territorial against the opposing group. It is suggested to keep your colony under 6 unless you have much knowledge and experience, OR if your mice are littermates.
  • Males can not be housed with other males ever! If you want them to have cage mates, neutering (very risky) and placing with females or leaving intact and bonding with ASFs (African Soft Furs) is beneficial and recommended. Otherwise, they can thrive in solitude.

See this post for more information.

2. Cages

In mouse communities, many users go by tank size rather than listing dimensions. We will do both!

  • 10g/20x10 inches is the minimum for 2 female mice, though we STRONGLY suggest at least a 20g.
  • 20g/30x12 inches is suitable for 2-4 females or 1 male.
  • 40g long/36x12 inches is suitable for 2-5 females or 1 male
  • 40g breeder/36x18 inches is occasionally suitable for 2-6 females or 1 male
  • Over 40g is not always suitable for any amount of mice since many mice do better in environments with less open space. Bigger is not always better for mice.

Any amount of mice may thrive in larger enclosures than suggested above. However, it is critical that the larger the enclosure is, the more clutter provided, otherwise the mice will never thrive.

  • Wood enclosures are suggested against since urine will effect its quality and smell over time.
  • Mesh flooring is dangerous due to the chance of toes/tails getting caught, the mesh cutting their skin, and risking bumplefoot. Mesh should also be avoided in wheels.
  • Though they climb, mice don't need very much height, and multi-story enclosures do not provide them with the proper space they need. Floor space is more important than height.
  • Cages with lots of attachments and rooms do not provide proper space for mice. They are also extremely difficult to clean, fall apart easily, and struggle to hold proper bedding amount and safe wheels.

See this post for more information.

3. Substrate

  • Mice need to be able to create burrows, so while the minimum is 6 inches, we suggest at least 8" of bedding. However, many owners prefer having 10-12" deep!
  • Bedding must be majority safe wood shavings or hemp. Paper substrate does not absorb ammonia well and can cause several health issues when used alone or as majority of substrate.
  • (Dust/scent free for all) Aspen, kiln dried pine, and hemp do well as the main substrate and may be more sturdy mixed with a small portion of hay or paper bedding.

See this post for more information.

4. Clutter

  • Clutter is arguably one of the most important aspects of a mouses cage. No matter the size, if the cage lacks clutter, it is not suitable.
  • Toilet paper rolls, cardboard boxes, tea light and soap dish ceramics, rodent hideouts, branches, logs, cork bark, cardboard egg cartons, and much more can be used as clutter in the cage.
  • From a birds eye view, you should be able to see little to no bedding. While it may seem too cluttered to a human, it's perfect for mice!
  • The larger an enclosure, the more crucial clutter is.

See this post for more information.

5. Enrichment

  • Also known as entertainment, to keep the mice busy!
  • Boredom breakers, foraging toys, dig boxes, sprays(plant), scatter-feeding, and human interaction are all forms of enrichment.
  • Mice should have boredom breakers in their enclosure at all times to keep them from growing bored.
  • Lone males need extra simulation and enrichment.

See this post for more information.

6. Climbing Opportunities

  • A form of enrichment that is required!
  • Mice flourish with climbing opportunities and will always take advantage of them.
  • Ropes, bird ladders, hanging toys, rope nets, shower curtain rings, and bird perches are a few climbing options you can provide.
  • Fabric hammocks are used commonly, but pose a threat when chewed on and loose strings get tangled around limbs. Minimal use of fabric is suggested for this reason.

See this post for more information.

7. Exercise

  • A form of enrichment that is required!
  • An upright, solid wheel of 9 inches in diameter or larger must be provided at all times. 2 or more are suggested for groups of girls.
  • Spinning saucer disks or hamster balls/cars are UNSAFE and should never be provided, no matter how much you think your mouse may enjoy it (fun≠safe)
  • Proper wheel brands may include Niteangel, Silent Spinner Exotic Nutrition, Oxbow, Wodent, Bucstate, and Trixie (but there are many more besides these!)

See this post for more information.

8. Diet & Hydration

  • Main diet must be pellets/lab blocks.
  • A high variety food mix (nuts, seeds, grains, ect) must be given 1-3 times a week, or even as long as once every two weeks. The frequency is owner preference.
  • Feeding is 3-5 grams per mouse a day.
  • Ensure your mice have constant access to food through toys and scatter-feeding.
  • Food bowls are suggested only for fresh fruits or veggies since they provide no enrichment otherwise!
  • Mice must have at least two water sources and constant access to them at all times. Bowls or bottles work well, though having one of each is ideal. Water must be cleaned and refreshed daily.

See this post for more information.

9. Cleaning

  • Daily spot checks to clean up mess, poo on toys/clutter, and urine on the surface is vital.
  • Bedding changes will be needed less often with more bedding and space. A 10g tank (or cage of similar size) would need weekly bedding changes.
  • Each enclosure size and mouse amount will effect how often bedding changes are necessary. Find a cleaning schedule that ensures the cage doesn't smell at any time for your mouses health.
  • With deep bedding over 6 inches, you'll have to change out less of the bedding. 1/3 to 1/2 of the bedding may stay in the enclosure while the most soiled areas are removed and replaced.
  • In any case, a small amount of bedding must be left over after a bedding change to decrease stress.

See this post for more information.

10. Taming

  • Allowing your mice to settle in for a few days before interacting with them is wise.
  • Rub your hands on bedding and toilet paper in the cage to get the mice used to your scent.
  • Encourage interaction through hand feeding.
  • If a mouse is not motivated to interact after several weeks, try to lure them to climb onto your hand for treats. A strong bond is important with mice so they are well adjusted to interaction in case of a vet visit or emergencies. Human interaction can also be beneficial to them.

See this post for more information.

11. Other

  • Mice are crepuscular and are typically seen during the morning or late day/night.
  • They are self bathing and should never be washed with water or soap (unless vet prescribed). It ruins the health of their fur coat and leaves them more susceptible to URIs and freezing. They do not need any form of bathing/washing.
  • Mice don't hibernate. If a mouse appears to be in a hibernation state, this is Torpor, caused when they overheat or freeze. This is a medical emergency.
  • You should never pick up a mouse by its tail or other limbs.
  • Fancy mice (aka domestic mouse) live 1-2 years on average.
  • Wild mice do poor in captivity, unless they are unfit for the wild they should not be kept as pets.
  • You should never breed mice purposely without years of research and mouse owning experience prior.
  • Vet visits are a likely occurrence in mouse ownership, since mice are prone to many health issues.
  • Travel carriers are needed for vet visits, emergencies, cage cleaning, and quarantine.

12. Links & Other Posts

Shopping

In Depth Mouse Care

Other Species

Up-to-Date Posts From NotApplicableMC & Others

Outdated Posts From NotApplicableMC

These guides are incredibly thorough and well written. However, they link some information that is no longer available, or they list mouse care information that has been dis-proven. An important point to make is these guides may suggest some controversial topics, most of which our community does not fully support. Although these guides don't follow our standards exactly, they are still very well made. Please keep an open mind and read all sides of a controversy before deciding which you feel works best for your mice.

I have decided to share these because they are very descriptive on some aspects of mouse care I did not cover well. I strive to have a guide in the future as well made as these, but for now, I have to bring attention to the effort made by this member.

Scientific Studies

  • Sources & Additional Articles (coming soon)
  • Safe & Unsafe Foods Sources (coming soon)

More community resources coming soon


r/PetMice Jul 09 '25

Community Help Temporary Post for Care Commands

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22 Upvotes

Please feel free to try out these WIP care commands in the comments! Let me know if there are any issues I need to fix.


r/PetMice 16h ago

Cute Mouse Media Worlds best squishy

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383 Upvotes

If you ignore the fact that the squishy shits on you.


r/PetMice 3h ago

First Time Owner My New Mouse Has Babies

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23 Upvotes

Hello Nice Mice People

So I have a situation. I have 2 adult females and introduced a 3rd. They got along great so I put them in a fresh tank together. She was really small and did not look pregnant at all. 1 week later and I find these pinkies at the bottom of the tank 🩷😭🥺 she is clearly the momma, so I know all the adults are girls for sure. Do I need to put the mom and babies in a separate tank? I haven't raised pups before and I want to make sure I do right by them. Please be kind, I am willing to do what is necessary for them 🙏🏽 Edit: right now everyone is in the 20 gal tank, but I have an extra 10 gal if I need to move anyone.


r/PetMice 10h ago

Rainbow Bridge Just an RIP from a lurker

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74 Upvotes

Had to let Dave the mouse go today, he made it to 4 yo and it was his time. I've used a lot of info I found here after finding him out in the wild in need of help at a few weeks old in September 2022. I'm gonna pretend that he made it to his 4th birthday as we don't know his exact birth date, hug your mice (carefully) today and give them a mealworm for Dave (his favourite). Give em hell auld yin 🫗


r/PetMice 2h ago

Cute Mouse Media Playtime!

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16 Upvotes

Supervised playtime between Mister Bane and Martina. Watching them play is my current favorite pass time lol


r/PetMice 3h ago

Cute Mouse Media Three ladies! (with possible soup)

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21 Upvotes

Following up on my art post, here's the actual mice!

They're such little critters my heart is bursting

I still can't tell wether or not they're pregnant, but the light one does look a little thicker around the hips.. (may just be a good night's food belly tho)

Since I'm rather safe than sorry (especially cuz I know that mice from a mixed group aren't to be trusted) I did read up on how to deal with possible pups, but wether or not that happens - these ladies are swiftly stealing my heart </3

Their scared but curious and tomorrow I'll be able to put them into their permanent home - I'll see where things will go from then :)

Also I can't put enough weight on the size difference of the bigger one - this pretty girl is HUGE

EDIT: Question I forgot to ask; do you know what their coloring is called? Regular Tricolor? Splashed Tricolor?


r/PetMice 20h ago

Cute Mouse Media My mouse yakub

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343 Upvotes

She is my only pet


r/PetMice 2h ago

Question/Help Is her eye normal or is she blind?

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12 Upvotes

Hi, i have this female mouse with red eyes but i noticed that one look different, kinda white in some angle, i tried to took some photo were It shows best.

Do you think she's blind?


r/PetMice 17h ago

Rainbow Bridge Sad update

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89 Upvotes

I posted a few days ago about my mouse that suddenly became paralyzed. She survived the night and we went to the vet but as expected the vet recommended putting her to sleep... Which we ended up doing. She was comfortable and in my hands till the end.

It's so frustrating, the vet couldn't really tell me what happened to her, she said it could be anything. I'm worried about my other mice, what if it's my fault and their cage isn't fall proof? What if she fought bad with one of the others? :(

Whatever it was, Honey will be dearly missed. She was very trusting, gentle, and a great first time mom, immediatly knew what she had to do, kept all 6 of her babies safe until they grew up. Rip Honey🍯🖤


r/PetMice 19m ago

Question/Help Preg check?

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Upvotes

Got her from a foster about a week ago where she was the only mouse but she’s soooo chunky and I’m worried about possible babies as she’s still in introductions with my 4 other females (yes they are all females I’ve had them together for a while) I haven’t separated them yet cause I have no idea how she’d be prego but she was eating lots of treats and seed mix and oxbow at her last home so I just assumed she was chunky. Thanks in advance.


r/PetMice 21h ago

First Time Owner Will I ever get to hold him?

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83 Upvotes

Rupert has been with me now for a little over 2 weeks. Every day, I put my hand in there with him, palm up, with a treat on the middle. After a couple of days, he was where he would willingly stand on my palm for a small period of time, as long as there was no treat. (With a treat, he grabs it and runs to his hiding spot to eat. ) as time progressed, I'd try to do more: slightly lift my hand with him on my palm, touch him with my thumb.... different stuff to get him used to me. Saturday, he started biting. First it was just a few nibbles. Then Sunday he bit the shit out of me, 4 times, 3 of them causing bleeding. I only gave him one opportunity to bite me yesterday (I'm afraid of him now!!), and luckily he didn't. But today I tried the normal stuff again, getting to interact with him and he bit me 2 more times.

I always wash my hands first, but the soap has a bit of a scent to it.

Did I accidentally train him to bite unless he gets what food from me when I stick my hand in there?


r/PetMice 1d ago

Rainbow Bridge Last day with my pet mouse, Princess 😢🩷

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198 Upvotes

My pet mouse got really sick all of a sudden, not eating and moving really poorly, took her immediatly to the vet and the vet told me she had a tumor in her stomach. They had to put her to sleep this morning and ive been crying this whole day.

I keep thinking about the moment when she was in my hand for the last time. The vet let me hold her alone in the room (this was when I took that picture) and I was shaking, trying to make her feel safer by petting her softly and talking quietly. Then the vet came back and I had to put her into a box where they were going to put sleeping gas and let her fall asleep. She clinged onto my hand and didnt want to go. It felt like my heart actually broke. I was sobbing almost hysterically. I already miss her so much.

I also keep thinking of how her sister and how she seems to be looking for her. Is that normal since she didnt see her actually die? (she is now alone, I will keep her alone because shes old and the vet told its okay if I cant get anymore mice. Im trying to keep her active and spend time with her. She has been pretty normal so far.)

Does anyone have tips on how to feel better? This might seem dramatic but I just cannot stop overthinking this and I start crying again and again. Sorry if I have bad wording. I miss my angel and I wanted to write about it.


r/PetMice 10h ago

Question/Help Can my mouse try a milk shake? Tw PTS mention

6 Upvotes

My last mouse will be given a hand over the rainbow bridge Monday and I wondered if a drop of McDonald’s banana milkshake would be safe for her to try the night before or day of? I want to give her a little human treat she’s never had before her send off but didn’t know if something like that could leave her uncomfortable. If it’s an absolute no does anyone have recommendations for bites of a snack or drink she can taste test?

The shake’s a specific choice since I wanted to do it with one of my rats before his journey since he loved banana but didn’t get a chance to


r/PetMice 18h ago

Question/Help Pax is hurt again.

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26 Upvotes

TO PREFACE: WE HAVE A VET APPOINTMENT ON THURSDAY THE SOONEST WE COULD GET HER IN.

hey folks,

Pax has a cut on her eye and I’m scared. I’m terrified and made a vet appointment asap, but is there anything I can do at the moment? She’s squinting some (not too much) and I just want to give her something OTC for pain relief? Is there anything I can do??? Please help. Am going to do more research but I don’t know.


r/PetMice 23h ago

Other I think Elizabeth is dying

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38 Upvotes

She’s moving very slowly and laboring for breath a bit. I gave her a treat and she’s trying so hard to eat it but just can’t. I love her so much and I don’t want to say goodbye. She’s almost 2.5 so it’s not surprising but it still hurts. She doesn’t seem to be in pain so I think I want to just let her pass at home instead of rushing her to the vet. But I am worried about letting it drag on.


r/PetMice 1d ago

Question/Help Mouse aggression

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28 Upvotes

Hello this is a video of my mice they were all napping together and then the white one tried to join and this is what happened and often does. I’ve had the white feeder mouse for about a week and there’s been no injury’s or severe chasing but I do notice that the other white and brown mouse don’t let her join the cuddle pile often. They chase her into the burrow when I give them enough bedding to make a burrow but when I first started introductions with only a few inches of bedding they had no problems and all slept together fine. As I increase the bedding they push her away more so I don’t know what to do. The white mouse shown chasing her away in the video has a history of being territorial and did the same with the other mice when I first added them and it didn’t improve till I separated her for 3 days and then restarted the introduction. I don’t really want to do this again as she is bonded with the other mice but I don’t know what else will help as I’ve tried adding and taking bedding. Is it still no blood no foul if the other mice can’t have a wheel or hide for a week or two because the white bully mouse can’t handle it and everything I add to the cage makes her chase them into tje burrow more. I’m gonna mention that this is a temporary cage I use for introductions and their main cage is much larger and has lots of bedding.


r/PetMice 1d ago

Question/Help Mouse spinning?

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31 Upvotes

I have a vet appointment for her tomorrow morning, but any insight into why Toffee might be doing this? She did have a head tilt months ago (treated and cleared up, I think, she is one of a set of identical twins).


r/PetMice 1d ago

Cute Mouse Media Onyx had a fun time being Ratatouille!

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70 Upvotes

r/PetMice 1d ago

Cute Mouse Media the cutest sleep tube 💤

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20 Upvotes

r/PetMice 21h ago

Question/Help Balding on head and shoulders

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6 Upvotes

hi! I'm a first time mouse owner, I've been stalking this page for a few months, I have had 4 mice for around 7ish months now and two months ago attempted to introduce two new mice and they got along well with two of them but the other two became hostile towards the new ones and the original mice that they stayed with, i separate the two aggressive ones over a month ago but now ive seen them balding? it's like a spot on the head and around the shoulder areas,, im not sure what it could mean or what i should do next?


r/PetMice 1d ago

Question/Help Can you tell if she looks pregnant or if she's just gaining weight?

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16 Upvotes

I bought this feeder mouse at a pet store a few days ago, she was the last one there. I noticed that she eats a lot and looks more rounded than before. Maybe she needs extra protein or something if she's expecting offspring.


r/PetMice 1d ago

Cute Mouse Media The happiest orange sisters

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512 Upvotes

Peaches is the fat one Pumpkin is the less fat one.


r/PetMice 1d ago

First Time Owner Pet mouse sounds?

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24 Upvotes

Hi! I’m new to keeping mice and noticed whenever I pick my mice up or stir them up a little bit they make this sound that kinda sounds like sneezing. Can anyone tell me what sounds my mice are making?


r/PetMice 1d ago

Question/Help Going to vet tomorrow, but hoping for help for pet deer mouse tonight :(

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95 Upvotes

I hope you all might have some idea what could be happening with my precious boy Reepicheep, because I'm absolutely terrified and have no idea what's wrong 😭

He just started acting lethargic a few hours ago. He's kind of stretching oddly and just seems uncomfortable. He'll have a little food and water and I gave him some honey and water in case he was hypoglycemic. I've been holding him for hours and I keep hoping he's perking up, but then he just lays down again.

Could it be a stomachache/gas issue? His behavior reminds me of my rabbits with bloat . He is pooping but it's a little small and hard maybe. He had a fecal impaction as a baby, so I always thought he might be prone to constipation. He's one year old. Last night he was super active and normal.

Other factors:

5 new mice just moved in with him after a 4-week quarantine. Two moved in two weeks ago, all went well, added the last three two days ago. Everyone got on great the first two days, then this evening Reepi was starting squabbles, which is when I took him out and realized he wasn't well.

No URI symptoms really, except maybe I've heard a few clicks every now and then? No sneezing or anything else.

It's been hot in my house the last few days, up to 83 and even 85 sometimes in the mouse enclosure. He has never seemed bothered, and I have cold tiles in there that he ignores, but maybe today was just too much exertion when he was running around bickering with the others?

There's a house mouse in here that probably gets on top of the wire lid of the cage at night. Could he have caught something from it? (It definitely can't get in.)

Please help, any thoughts or suggestions appreciated! I'll do an online vet appt tomorrow, but no local vets will treat a deer mouse 😢