Well, we have an RV and had our little "Muffin"dog. She was 16 when finally had to go to Doggie Heaven. We decided then, no more dogs while traveling. Then a stray cat began to hang around our yard.
we finally adopted him, (or should I say, he adopted us). We said he was "Muffin' reincarnated, because we wern't going to get another dog, so what appeared, but a cat. He is a beautiful Norwegian Forest cat. Doesn't travel with us because he loves to be outside too much for the confines of a motorhome. However, we also have a few desert tortoises who live in our back yard. They hibernate all winter, so are very low maintanence for those who like to travel. Hard to say what is the favorite, but probably a dog would be # 1.