As long as your mouse has a healthy diet, plenty of water and lots to keep him occupied in his cage, he should live happily for a few years. However, these rodents are more prone to tumours, which usually develop with age. Tumours usually form behind the legs and on the neck, so if you start to see any swellings in these areas, consult your vet immediately.
Get to know your mice, and learn how they usually behave and carry out normal day-to-day activities. You'll soon become aware if anything changes and if your mouse starts to act differently. When mice get ill their health starts to go downhill quite fast, so you must have them seen to by a vet as soon as you notice any signs of illness.
Signs of an unhealthy mouse:
- Loss of appetite
- Drinking more or less than normal
- Lack of energy and sleeping a lot more
- Hunched posture
- Scratching more than usual
- Overgrown teeth
- Sensitive when touched
- Redness around the eyes
Problems with lungs and breathing are also common in mice due to their very sensitive respiratory systems. So making sure that all bedding you use is dust-extracted is essential. Take your mouse to a vet quickly if you do spot any signs of lung problems (rasping, struggling to breathe etc).
Mice don't need annual vaccinations like most other pets, so look after them the best you can and always keep a close eye on their health just in case any problems do start to develop.