Here are a few pet related ones that I like:
The Modern Pet - very cool collars and leashes
Artwork by Andrea - drawings and paintings of dogs, cats and more
Lodi and Lewi - more great collars, and leashes
Amelia Makes Art - little wool dogs and cats made to look like yours! (some of these are kind of creepy looking but others are pretty cute)
I could go on, and on, but maybe I better leave you to explore on your own.