Cat's intelligence

Today Awang the male cat,lets me pat him on the head. No more hissing or being hostile. Usually I would take out the flesh of the fish and give it on a plate to Tompok. I would give him the whole fish. Today I have two kind of fish. One I had bought yesterday and it was not so big and another the house hold fish which is plumper . So, I boil the fish and I had wanted to give the smaller fish,head and all to Awang. He refused to take it !! So I took the flesh of the two fish and feed both and he ate it. Cats do have feelings or mind . Or whatever . It means that he knows the difference ???