I wasn't sure where to post this...
Beaphar Anti-Parasite Spot On
I found this on Amazon... it's an Ivermectin Spot On treatment for rabbits, guinea-pigs, ferrets and rats over 300g. The dosage is perfect for squirrels!!! I put it on Hazel and she didn't have any ill effects. I will keep you all posted on whether or not it works. I'm not even sure if she has mites, but just in case.
The only drawback is that this is a U.K. product so it takes about a week to get here via Royal Post. It is a lot cheaper than Revolution, no prescription required and it is already the correct dosage. It says it works against lice, fleas, mange mites, other mites and roundworms.
Just thought I'd get this information out there.