Is it big enough for two rabbits?

The maker rates it for two to four rabbits. The living house is roughly 29 by 18 inches, so two average rabbits fit, but four would be cramped and need more run time outside.

Can it stay outside all year?

The asphalt roof and fir frame are made for outdoor use. Fir is soft wood, so treat it or add a cover to slow weathering, and check the wire and latches regularly.

How hard is assembly?

It comes flat-packed with an instruction manual and needs screwdriver and some patience. Expect a couple of hours for one person, easier with two.

Does it work for guinea pigs?

Yes. The ramp and low run suit guinea pigs, though they climb less readily than rabbits, so keep the ramp angle gentle and add bedding for grip.

Pull out the sliding trays under the main house and the run boxes, empty and wipe them. The lockable doors let you reach the rest of the floor.

Is the wire strong enough to keep predators out?

The steel wire keeps rabbits in and gives ventilation, but it is not heavy gauge. Place it on firm ground or a paved base and check latches, especially at night.