Aggressive behaviour

[Richyrich91]

One of my cats came back from the vets yesterday after having an operation but since then my other cat has been constantly hissing and growling at both him and me, is there a reason for this and is there anything I can do?

[bobbys girl]

Not to put too finer point on it - Your cat smells funny! A cat's sense of smell is much better than ours, your 'aggressive' cat can smell the vets on you and his friend. He should settle down in time.