Cats. First,all your base are belong to them.
Second,cats are favoured by artists,dogs are favoured by soldiers. Dog is blindly loyal,and if master orders to,it will murder someone without any consideration. Dog is the epitome of conformism. DOG IS THE MAN.
And since i'm an artistic person who also happens to dislike conformism and establishment...
/rant
Third,everytime i see a dog i suspect that it's intent is to run up to me and chew my balls off. I don't trust them.
Fourth,cats are cute. Dogs,not so much.
And as last but not least,fifth. Cats shit in manageable ways,like a budgerigar. Dogs need to be taken out for walk and taking a shit EVERY DAY.