I would like to acknowledge one of my reviews, Goldie was nicked by another dog I was sitting and I kept them separated after the incident. I have 3 spare rooms so can always separate multiple stays as necessary. I also keep chicken wire and stakes in case I need to separate outside time as well. My Stella is an alpha female dog and she does have a tendency to show dominance to dogs her size and bigger, she does this by "humping" if they won't play with her, as dogs do. She is fixed though so that's all it is. Not something necessarily trainable on as we don't have guests 24/7 but I do work with her on it anytime it happens :-) I honestly probably shouldn't say this but I like dogs more than people! My dog is very well socialized and will provide a lovable playmate for your dog, a nurturing presence for your pup, or a properly distanced chill, almost, cuddle time for your older dog. I believe my dog is a part of my family and any dog that enters my home will be treated just the same. I do let my dog sleep in the bed with me, however, if that is not your way just let me know I have 2 offices and a spare a bedroom I can utilize to make them comfortable and if you're the kennel type I do still have a kennel that can accommodate a dog up to around 70 lbs provided they aren't a super tall breed, but it would be better if you brought their kennel (it smells like home to them, etc). I can accommodate any dog personality you throw at me, so please allow me the pleasure of taking care of your best friend :-)