What medicines were made for animals?

Did you mean ARE animals used for medicines? If so then yes, they are. Although, in my opinion there should be a better way to test drugs instead of making animals unhappy, ill or even killing them. I'm surprised that the SPCA hasn't done anything about it. I think it's disgusting to see, for example, a dog that is so doped up with drugs that it cannot even walk without collapsing left and right. It was even worse to see a kitten vomiting after being the tester of an injected drug not tested. It makes me want to cry when I remember those images. Hopefully one day they'll realise that what they are doing is wrong, maybe even evil.

The most frequently used animals are the mice

They are the best laboratory animals because they are the most suitable for this job

I didnt really understand why but you can check it out on bigmountaindrugs.com