How big is your rabbit?

Wow! That is a big rabbit. Is he is Flemish Giant? If so, that's probably a healthy weight for that breed or one of those large breeds. As long as he doesn't actually look or feel like a fat bunny. My 13 year old rabbit is 5 pounds. When we got him as a 4 year old, he was 7 pounds and had a lot of fat on him because his previous owners only fed him pellets in a giant dish. But here he's been on a pellet free diet for the most part and has been doing great on that. My younger rabbit who is probably around 3, she's about 7 pounds and not overweight, just a bit bigger of a rabbit. I found her running around outside and she was about 6 pounds then but not really horribly underweight or anything since old people had been feeding her plus there was plenty of grass to eat.

Depending on the breed and type of bunny he or she is will depend on size and weight. I bred and raised dutch, mini lops, rex, and himalayans. They pretty much averaged 3 to 8 lbs full grown except for the rex and himalayans. Depending on breed and also sometimes what a bunny is fed can cause them to be larger. I just found this so hope you still have your bunny. Glad you have a good running space for him. Exercise is so important to their health. I was always sad to see bunnies just locked up in a cage. I actually bought a play yard outside for all my bunnies to have time to run and eat grass etc. Every bunny I raised was pure pet. They were held from the day they were born and did not know to be afraid of people. Here is the list of rabbits that might help you decide what size your bunny should be. http://www.arba.net/breeds.htm