He looks quite overweight, so I would cut pellets out of his diet totally. Unlimited hay and a nice big salad divided into a breakfast and dinner would be fine. Make sure you are giving him a good mix of veggies, just like with guinea pigs. A foster bunny of mine came in recently very obese and with lots of exercise and cutting out pellets, she is now a healthy weight.
The butt mats are probably due to him being overweight. You can give him a butt bath, where just his butt gets a little wet, and try to massage the mats out. A furminator works wonders with grooming.
As for a cage, as long as his litter box habits are good, you don't need a cage at all. If you do need an area where you can close him off, a large bathroom with a baby gate works great (as long as there are lots of blankets and beds to keep his feet off the hard floor). A large puppy exercise pen is what I suggest as bunny cages though. They are easy to fit in any area of the house and give a lot of room. If your piggy cages are large you can also build the rabbit cage under it. I have some examples of my own cages built this way in my gallery.
So glad you will be getting him neutered and getting him a girlfriend!
Oh, and The House Rabbit Society (House Rabbit Society Rabbit Care Guide) is a wonderful resource for any bunny owner!
The butt mats are probably due to him being overweight. You can give him a butt bath, where just his butt gets a little wet, and try to massage the mats out. A furminator works wonders with grooming.
As for a cage, as long as his litter box habits are good, you don't need a cage at all. If you do need an area where you can close him off, a large bathroom with a baby gate works great (as long as there are lots of blankets and beds to keep his feet off the hard floor). A large puppy exercise pen is what I suggest as bunny cages though. They are easy to fit in any area of the house and give a lot of room. If your piggy cages are large you can also build the rabbit cage under it. I have some examples of my own cages built this way in my gallery.
So glad you will be getting him neutered and getting him a girlfriend!
Oh, and The House Rabbit Society (House Rabbit Society Rabbit Care Guide) is a wonderful resource for any bunny owner!