I started with my cat, Mona:
On a different day I drew Arco, my boyfriend's Labrador Retriever. I was sitting on top of the stairs and he wanted to come up to me (left picture; he's somewhat scared of climbing stairs)^^'. Until he gave up and lay down (right).
And then I tossed him a ball and he went all crazy :D
Left side: I told him to sit, but he was still in play-mode and twitchy. :D Right: I then moved on to my dog Vicky, a crazy terrier crossbreed. She's always really jaunty, so her scribbles were the most challenging therefore look kind of silly. xD