I think i posted before, on how my older boy lost his friend. And become depressed! I got him a new friend with slow introductions. There has been no blood, or bites. But my older boy chases his cage mate. They have lived together for about 3 months now, and will even steal treats from him. Yet at the same time the next minute, they are cuddled together. My older boy Caius has had respiratory issues, and its ongoing he has been on baytril and when medication stops, the respiratory issues come back. So my issue is when taking him for a neuter be too stressful for him? Caius shows no aggression towards me of anykind. He had never been a cuddly rat mind you, but he loves coming out for treats. I have had him almost a year now!