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What kind of device? If it's ultrasonic, not in the long run.
no
Because hawks eat rabbits
running
It doesn't
yes.
the rabbits leave dropping everywhere which acts as a kind of fertilizer its not just European rabbits though.
Normally, smaller rabbits live longer than larger rabbits.
depend on if the deers are afraid of dogs
Ultrasonic pets repellents don't even affect pests, let alone household pets. The sound waves get blocked by things like furniture, floors, ceilings and walls, which makes them near useless. I would get my money back for it and call an exterminator.
People may think less of you, but it's unlikely it will cause brain damage.
Yes, when i got a second rabbit, it was my firsts rabbits territory and he was very aggressive to the new rabbit. And males are more dominant toward other rabbits.