Leather washes well!Are you going to be driving with them in the back? If so, what Pyxis said about temperature is spot on - they need to not be 'boiled alive' at human comfort level. Have you got a daytime stash area for them? Perhaps in the house while you are out? Husbands' den perhaps...
Lol, you're terrible

How are the d'uccles, by the way?