Good for you for saying something!! I would have said something too. People that know me know I will not sit quitely when talk of animals is brought up.
In fact, a co-worker I was talking to the other day apologized to me before she even told me that her dog was not fixed.........yet. She said they are going to be getting him fixed soon. I just laughed. She knew I'd lecture her about it.

My brother and SIL got rid of their cat when my niece was born. But that was because even before she was born they just weren't giving him the attention he deserved. It had nothing to do with the cat and the baby living together. They found a good loving home for him. My SIL was sad to let him go, but knew it was best for him.