The cat certainly sounds like he has some aggression problems. They can be tamed, but it might take more work and patience than you are willing to put in.



Before returning him to the shelter, see if you can talk to some people who have had contact with the cat while he was there. They should have noticed any aggressive behaviors and might be able to give you advice about how they handled it.



You might want to give the cat more time to adjust, however he should NOT be let out of the room where he stays - he should not be going outside because this can increase his aggression.



I am concerned about the fact that he bit so hard and with so little provocation. If you can get him to a vet for a full vet exam, this might be a good thing. There may be an underlying medical cause - for example when you moved him he felt pain for some reason.



Good luck. I know you want to do your best by this kitty. He may not work out for you - but perhaps the shelter can work with him further and place him where he is a single cat.




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Smile, it will make them wonder what you are up to!

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