Those are good. Some of those I'd never heard of. I love this one:

"To err is human:To forgive, canine."

- Anonymous


And these:
"In order to keep a true perspective of one's importance,
everyone should have a dog that will worship him
and a cat that will ignore him."
-- Dereke Bruce, Taipei, Taiwan

"I've seen a look in dogs eyes,
a quickly vanishing look of amazed contempt,
and I am convinced that basically dogs think humans are nuts."
-- John Steinbeck

I have a great dog. She's half Lab, half pit bull. A good combination. Sure, she might bite off my leg, but she'll bring it back to me.
-- Jimi Celeste

Dogs are the leaders of the planet. If you see two life forms, one of them's making a poop, the other one's carrying it for him, who would you assume is in charge.
-- Jerry Seinfeld