Do the posts have to be just about bunnies or any type of pet??

BTW, I have a question for you about bunnies. My friend has a chinchilla bunny who is so cool!! HIS name is Guen (they thought he was a girl at first) and he's 3 years old. Anyway, he keeps getting these ulcers on his back legs near the bone joint. She has a cage that does not have a grated bottom (the vet recommended a smooth bottom). I took Guen to the vet yesterday and he was put on antibiotics (raspberry flavored ). Is it common for rabbits to get these types of sores? Is it due to inactivity?? She tries to let him out of the cage to run around the den (he's litterbox trained). Any suggestions??

Thanks. I will definitely check out your website.