Let me see if I can rephrase this question and perhaps formulate an answer for it. You're saying that dog owners will feed their dog but not help other people out. Then you are suggesting that cat owners are more generous than dog owners?

I have had both cats and dogs in my lifetime and I don't believe owners of either are more or less generous than fellow humans. Most of the time I prefer animals to people anyways. They're usually nicer and more loving though not too big on conversation.