[Jack Garcia]

With any lice/mite infestation you must treat in cycles so that you kill all the adults and then all the adults that emerge from the eggs that are present. If you treated only once or only over the course of a few days, you did not kill all the parasites. Revolution will not treat all mouse mites and lice and is not recommended for rodents.

Since you are in the US, if you can find a Tractor Supply Store or most other farm stores, you will find a product called Iver-on. It's a spray-on antiparasitic treatment for cattle. Dilute this 1 part Iver-on to 5 parts water, and spray the mouse, the cage, and the bedding every week for three weeks or twice a week for three weeks. If it's any kind of microscopic parasite Iver-on will get rid of them and it will also coincidentally cure most internal parasites (like worms).

Don't worry about getting it on their food or in their eyes. It has never hurt any of the dozens of mice I've treated with it.

Since I haven't seen the mouse in question, I can't say that external parasites are for sure the cause of the ailment, but the Iver-on treatment works as a preventative anyway.

(I wouldn't use the ivermectin paste for horses because it's dosed too strongly and even a tiny bit smaller than a grain of rice can kill a mouse.)

 

[Jack Garcia]

"Ivermectin" paste is slightly different from the product called "Iver-On," as Iver-On is a spray-on application which is mixed more evenly than the paste and will not cause overdose (which includes the seizures and organ failure you experience) when used properly. Iver-On is a generalist application and gets rid of all but two external and internal parasites common to mice whereas both Revolution and Sevin dust target some parasites and leave others unharmed.

Revolution is great for dogs and cats, but the parasites they get are more endemic to their species (namely the cat flea, Ctenocephalides felis), which do not normally occur on mice.

Iver-On is the best option available, especially when you don't know for sure which parasite you're dealing with. If you do not have a Tractor Supply Store or other farm/feed store near you, you may purchase it online here:

http://www.jefferslivestock.com/ssc/pro ... id=0026251

 

[Jack Garcia]

Small animal technicians and even veterinarians can give notoriously inaccurate advice. Mice are not a common animal to treat in any respect. I don't know enough about Revolution to say it is bad; I'm not saying that. But I am saying that Iver-On has a broader scope and is thus more effective, especially in a case such as this when the exact species of parasite (if any) is unknown.

 

[Jack Garcia]

Good show breeders in the US would also cull weaker or sicker animals. I would.

But I'm not a pet owner. Pet owners have more invested in individual animals whereas show breeders have more invested in the entire colony or an overall goal, so we do things differently.