I hate cats. I am very allergic to them and they seem to have a mind of their own moreso than a dog.
You can kick the living s*** out of a dog and it will still come back and eat out of your hand. If you try to pet a cat and it doesn't like it it hisses at you and wants to kill you.
And cats play with things too much, like when Galactic's cat pulled the network cable out of the machine running the IRCd.
Furthermore my neighbor had four cats. They liked to go in my yard and piss all over the bushes, and once I found one of his cats in my garage, it had jumped up on top of the car. Needless to say I was really pissed. I don't think there are many dogs that would just go in a neighbors garage and jump on their cars.