Hello everyone,
I have two male guineapigs. One of them is 3 months old and the other one is 6 years old. Recently i saw these brown spots in their white cardbox. I was concerned that maybe one of them has UTI and took one of them to the vet. He was treated with bactrim for a week. After that i saw these spots again and neither i nor the vet is sure that they are bloody spots. I also separated them and made them pee but the pee was normal and transparent, still i saw these spots after that. Please help me identify this I am concerned.