Could you give him free-run of your kitchen? It seems like kitchens are usually the easiest to bunny-proof. Could you put the dog in a crate or another room while Echo is getting play time?
You also might look into building him a NIC cube condo to give him more room with less floor space. You can get creative with the shape and number of levels, so you might be able to fit something in a space you hadn’t thought would work. You would still want to give him run-around time each day, but it might give you more options.
Also, it seems to me that the baby would be exposed to the rabbit fur etc no matter where Echo’s cage was, so it might not be the worst to just keep him in the spare room….
.
.
.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.