I always thought a cat was a small domesticated carnivorous mammal

Jill Y has one of those jobs that most people would love to have. She is a scientist and works on secret experiments. Well, secret until I tell you all about it! Recently she was working on making guide dogs invisible. I can't say I understand the benefit of invisible guide dogs but then again, I don't understand algebra either. I'm about as intelligent as something Jessica Simpson would read. Sometimes she brings her work home and I pretend I have a clue what she's talking about. Beer usually helps with this. The other night got a bit out of hand. She was rabbiting on about growth hormones, cats and a big mistake she made: