I double book all the time. I have to if I'm going to pay the bills:) I find that I have these easiest time doing this when I have watched the same dogs multiple times. Now when I get requests if I have watched the dog before I know their temperment and how they get along with other dogs thus I know if its ok to book another dog. That being said I always do a meet and greet with new dogs so they can meet my dog and any guests I have. If they are fine with my dog, then most likely they will be with other dogs too. I rely on the owner to be honest and up front about any issues their dog may have and for the most part in the 30+ dogs I have watched I have only had two that did not get along with the other dog or just get along with my dog only so I only book them if I don't have other dogs booked. For example: I have 5 dogs this weekend, two of which I have watched several times and they love being around other dogs and the 1st time sits are smaller dogs and they all did well at the meet and greet. I think what you have to gauge when you meet and greet a new dog is their behavior. Are they calm, or do they seem anxious and bark a lot? Do they growl or seem afraid of your dog? You know it will be a good match if the dog is calm, reacts to any other dogs you have there by sniffing behinds and letting the other dogs sniff it's behind which shows they are comfortable with the other dogs and. If they are calm and friendly with your dog(s) they most likely will be fine with other dogs that are staying at the same time as their sit too. Dogs are very social and love being around their kind. I think we humans tend to worry too much and the dogs sense that and that is when problems occur. If you have a dog that gets into a very excited state, remove them from the pack until they calm down. I'm telling you it works. I have had up to 7 dogs all together in my yard and they all just hang out and enjoy each others company. And, many day care centers will have up to 20 or 25 dogs together. It depends on how comfortable you are with the number of dogs you have. If having more than one or two makes you a little nervous and uncomfortable, then don't do it until you gain some experience watching more and more dogs, and eventually you will start to get a feel for them and be ok having more:

However, even though the dogs get along, I would ALWAYS separate them when feeding just to be safe... (more)