I do not solicit for dog shows. 1) I don't have the time to be gone for them 2) I don't know all the breeds well enough to do a proper job.
I do know whippets because I have whippets. I know what the whippet people want to see. I know how a whippet should be stacked and exactly what the gait should look like.
Pet photography is a whole nother can of worms. You really have to know what the client is looking for. Do they want the collar on or off? Do they want "cute" photos or artistic ones? I have found pet people somewhat easier, and yet, harder. The show dogs are better behaved, but the clients are MUCH more picky. The pet dogs are wild and usually(not always) out of control and you better know how to channel that and still get the shot.
With wildlife, you wait and it will eventually come(if you are lucky) You just have to be patient and aware. With pets, you must be in control, direct, be patient, not get rattled, not let the people rattle you. You have to know how to get the cute expression, and shoot fast!