Not sure about others, but our 4 legged kids are our babies. No amount of money would sway me to consider loaning them to a stranger. Like children they need supervision, how can you concentrate on the shoot and keep watch on them. My suggestion is to seek out a trainer who will not only supply the animals, but be responsible for them, and provides insurance to cover not only the animals but everyone else on the set. What happens if that sweet little mutt takes a dislike to your model and tries to chew their face off?