What's so wrong with the People for the Eating of Tasty Animals?

I was reading through my MIL's PeTA magazine last weekend.

They are a sick and disgusting bunch. They want people to box up their dog's feces and send them to the president of IAM's and let him know that their practices with their dogs stink. However, if what they say is true, and I highly doubt 95% of what they have to say, IAM's cuts off large chunks of muscle from dogs (and don't give them veterinary care afterwards) legs to test whether or not the food is nutrional enough. I'm sure that they only take a few cells from the muscle of their test dogs.