Quote Originally Posted by Bogertophis View Post
Agree with Deborah's post above, & if only one mouse has health issues, personally I'd euthanize it to prevent the spread to the colony, though it may be too late.
I've raised my own mice for a few decades & they've stayed healthy...it's always a risk adding "new blood" that bring other things (such as mites) to the group.

How long have you been raising mice? Is there more than one male in group? They fight, so it's not surprising that they end up with injuries & infections, & stress
lowers their immune system, making it easier for mites & systemic illness (& yes, he's sick, IMO). If he's your only breeder, I'd replace him, which can be tricky-
the females may resist accepting a new male, or the new male may attack them instead of "bringing candy & flowers". Male mice can be real jerks.
Also I have never been able to get the two to breed


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