I took my [guinea] pigs in to get sexed. I assumed they were male, but were being very friendly with eachother. I called to make an apointment and was delighted to find that indeed they did have a "guinea pig doctor". They also mentioned that they've done many guinea pig spay and neuter surgeries if i needed that option, which i didn't but it was really great to know. The doctor I met with quickly showed me how to tell that they were both boys, and answered EVERY question I had about my little guys. They seemed like they loved guinea pigs as much as i do, and that's hard! I would recommend them to anyone else with small or exotic animals!