I am not into this fetish, and have never tried it, and know nothing about the practical or legal aspects.

I did once have an online friendship with a vet who I disgussed it with. According to him whilst the physical side was very easy the big issue lay with the dog's psychology. They are pack animals, and if they are to be domesticated they need to accept humans higher up in the pecking order. A male dog does not consider his bitch to be socially supperior to him, so is unlikely to take commands from a human he has sex with. Result one out of control and confused dog.

Just my penny's worth.

cariad