What I DON'T like about releases is that many of them don't use simple terminology which I believe can make them intimidating. I do not want the pet owners to feel bluffed.
Whether it is a legality or not, I am going to continue to seek permission from the animal owners. Especially in the case of purebred/show animals where the owner wants to see the best image used and in fact might want to be consulted on specific images.
Maybe with pets or cross breeds its different because they arent aiming for a certain breed/type standard/representation.
I am still tweaking my releases.