If you have outdoor hutches, you need something under the wire floor to protect the rabbits feet--a bin or chute is good, but in a pinch, I have just run 2x4 fencing wire tacked to the cage a few inches below the cage floor. Manure still falls through, but dogs, or raccoons, can't grab the rabbits toes from underneath.
I have lost rabbits to dogs biting their feet from underneath. It is an ugly business.
The cats are mostly just curious I would say, and less likely to try to actually break in to a hutch than a dog or raccoon. They watch the rabbits the same way they watch a bird thru a window, but most adult commercial rabbits could about take a cat on in a fight, it is the injured, or a fallen kit, that a cat would be interested in.
Maggie's right, you can't poison everything, just start thinking of your hutches like Fort Knox.