My bro-inlaw is staying in a lovely gite with it's own private pools and grounds at the moment, it's more south of France though.
We're going to Saint Jean De Monts, near Nantes, in the Loire region. We go every year, it's a lovely sea-side town. My in-laws have a 3 bed apartment right on the beach, just go across a zebra crossing right outside the door & you're on a fabulous beach, ideal area for children. Me & OH might slip away for a day or two on our own, inlaws will love to take charge of the girls. My mother-inlaw is French, from Paris, so OH is fluent in the lingo which is quite handy
I'm sure you'll find somewhere suitable for your dogs, the French love their pets. I love labs, my favourite dog, unfortunately I've asthma so pets are a no-no. We have a visiting neighbourhood cat that the girls love & we feed, but technically we're a pet-free home.