We just got a beagle puppy last spring and did several RV trips with him. We also have a 15 year old wiener dog.
While underway the puppy stayed in a pet carrier on the doghouse between the seats. There are a couple dash vents there which provided heat or A/C as needed. He was somewhat vocal at times but for the most part he would stay passed out.
Our vet advised us that a puppy's immune system isn't developed and to avoid interactions with other dogs and places dogs have been. So that meant potty excursions on less oft used trails or woods. He did however attract attention by anyone that saw him (he's sooo cuuute) so we got to meet most everyone in the park or campground.
Probably the worst part of it was the frequent trips outside, which translates to having to take him out in the middle of the night. So the trips weren't particularly restful for me having to manage the dogs but since we don't have a toad we were pretty much confined to the park or campground anyway, so it was just part of the trip. He quickly adapted to RV life finding my seat to be adequately comfortable and to my dismay having fun licking condensation off the windshield and leaving it covered in slobber. No issues with him chewing on anything in the RV. We brought all his chew toys and if he wasn't going to town on those there was always one of my shoes on the steps. :-\ He could fit under the couch and thought it was great fun to hide under there. The wiener dog is a veteran, he started out with us camping in a tent so the RV is an extension of home. He likes laying on a door mat we keep on the dash and keeping an eye out for squirrels.
Looking forward to this year now that the puppy is housebroken and we can go on long hikes, and I can sleep all night.
Mark B.
Albuquerque, NM