Aggressive hamster.

Dr. Marie replied:

Hi and thanks for your question.

I have seen a number of hamsters who bite when frightened. It's hard to say why he was allowing you to handle him yesterday though and not today.

My guess is that he is frightened about his new surroundings. There is a good chance that given a few days to a week in his new home he will be much more tame.

For now it's best to only pet him when he is accepting your attention. Never try to handle him when awake and immediately put him back if he starts to get aggressive.

Try to approach him regularly with some sort of treat that he may like such as a vegetable like broccoli. Don't push things too far. So, offer him the food and see if he will let you pet him. It shouldn't take long for him to come around.

It is also possible that he is aggressive because there is pain somewhere. If this is the case you will likely notice a lack of appetite and also lethargy. If you are seeing this then you should have your vet look at him.

I think, knowing that he was tame at first gives me hope that he will calm down soon.

Dr. Marie.

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