I see a lot of pets on this site
I was just looking for some insight as to how others interpret this fetish (which I just typoed as "petish," lol). For me it's not really about costuming very much. I've contemplated some cute little kitty ears, and I play at purring and talk about myself as being a kitty, though that's not a huge focus.
I enjoy being a pet because there's both a strictness and care aspect. You train a RL animal-pet how to do certain things, you expect certain behaviors, you feed and bathe them (hopefully :P), and you love and cuddle them after you take them out for a walk or for playtime. Oh, and they get to sleep in your bed at night ^_^
All of these things I find appealing about being my Master's pet. He trains me to behave certain ways in different scenarios and rewards or punishes me appropriately, we have playtime, and we also enjoy the mundane things like feeding, bathing, and a good ol' walk on the collar and leash.
That's a nutshell summary about my experiences, but I'm just curious how others weave the pet fetish/kink into their lives.