Traveling with a dog
We took our 100 + pound, 8 year old dalmation with us on our coast to coast odyssey last summer in our 34' SeaView motorhome. No problems whatsoever! He generally let us know it was time to stop by the degree and frequency of his flacturating (gas passing, darn if I can find the correct spelling). We left him in the MH every now and then, usually not more than an hour. When we were "dry camping", usually at WalMart, we left the generator and the front ac on. I Remember we were camped at Cumberland state park in Tennesse (very, very beautiful, the state operates a buffet style cafertia, outstanding food, unbelieveable view, and the waitress wouldn't take a tip! (state employee)). But I disgress! As it was a warm night I tied Domino up outside for the night, around two or three in the morning he woke us up and probably half the campground. I forgot about the racoons Tennesse is famous for. When they came a calling Domino did what dogs do; barked like hell. I think that was the first and last time I put him out for the night! About the only non standard equipment we got for him was a non spillable water dish from Campers World, (7, 8 bucks).
Since then we sold the MH and bought a pickup/5th wheel. Domino will be us in that too! Good luck.