While looking over the colony rabbits we found a doe with horribly swollen genitals that protrude out several inches. The anus is even forced open some by the swelling. There are no sores, scabs, etc... on the genitals or anywhere else so I'm not sure if syphilis matches. The whole area looks more like it received trauma, they did manage to pull up the edge of some chicken wire, and developed a horrid bacterial infection or a prolaspe. I debated just putting the rabbit down but I decided she could be a learning experience and just in case it turns out to be syphilis or something contagious I'd get a jump start on how to treat it before it shows up in the others. So how do you give rabbits a penicillin injection? I've done intramuscular injections on horses. Where at, what size needle, and so forth do you need for a rabbit? If I didn't just spend $2,100 on a dog, $4000 on new floors, need to get my cat UTD on shots to rehome her, and have some routine parakeet vet bills upcoming I would get the less expensive vet's opinion but vet fund and most other funds are rather wiped out at the moment.