What is it about cats?

[bystander]

I have a cat that will scratch and bite suddenly for no apparant reason. A few weeks ago the cat was trying to rub up against the neighbor's dog. All of a sudden the cat sunk it's claws into the dog's head. The dog let out a yelp then wanted to attack the cat.

Sometimes I will be going into my house and I guess the cat wants me to stay outside so he'll run up to me and bite my feet. Once he bit me and drew blood. I think this cat may have toxoplasmosis.

http://en.wikipedia.org/wiki/Toxoplasma_gondii