Every time we buy ice cream Castro steals it, and i try to take it back and he grabs it from me rudely, so what do i do?

I know right, he does the same to me I am getting pissed off, but then I tried feeding him pizza, he stopped for about a week.

Every time we buy ice cream Castro steals it, and i try to take it back and he grabs it from me rudely, so what do i do?