cat humps after being neutered

I have a year old male cat who was neutererd. Lately when he carries his favorite toy mouse around he will either come by you or on your slippers or even pillows and start kneeding but then he will place his butt down and it looks like he is humping the object. What would cause this and how would I be able to rectify it.

Answer by Kate
well this is unusual. The quick answer is that he shouldn't be humping as he wont have the hormones which would trigger the behavior.
It may be learned behavior similar to the neading ie it makes him feel good like, memories of his kittenhood and his mother. So this behavior may just feel good and so he does it.

How to stop it is trickier. Apart from removing the item as soon as he starts the behavior. When you take it away, do it quickly and quietly every time. Also try to distract him with toys to take his mind off the behavior.

best wishes kate