Judging from the tone and content of the letter, I'm going to guess the guy is not a dog lover:
"Editor: I hope I'm not the only one who is annoyed over the elevation of mere dogs to the status of children. Dog day care, dog birthday parties, dog summer camp, dog play dates, a school bus that takes dogs to the dog park, enough already! This mass hysteria needs to stop. Dogs are just domesticated wolves, they are not children with a tail."
I did an Internet search on the name of the person who submitted the letter and found a similar one, in another newspaper in another state. So, it's obvious this person is on a bit of a crusade. Motivated by what, I don't know. Maybe he, or someone close to him, was attacked by a dog.