I would say he would be best off in the hutch with a warming lamp. That is, if your rabbits hutch is a large one. If it's small then just do the hay inside the hutch because the warming lamp would be too much. Does the hutch have an open pen area for...
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i have guinea pigs and id say 3 in the 5ft lager one and stick with 2 in the smaller one as the other person said so they dont fight over space and such and they just have lots of room to move around comfortably!!! hope this helps =D