Common health problems to look out for in mice:

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- Tumours, particularly mammary tumours in female mice. These are often cancerous. Have them removed by a mouse-savvy vet if the mouse is otherwise healthy and a good candidate for surgery

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- Itching, can be mites but also sometimes can be behavioural. The vet will be able to check the cause and prescribe appropriate treatment

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- Respiratory problems are very common in mice, antibiotics are needed. Make sure to see a mouse-savvy vet because most vets aren't good with mice and might prescribe ineffective antibiotics (happens a lot!)

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- Change in their posture can indicate something is wrong even if you've not spotted any other symptoms. If you mouse starts having a hunched back take them to the vets, even if they're still eating & drinking