Unfriendly dog staying over?

When I first started pet sitting I have accepted a dog that the owner said was great with other dogs only to find that after the owner left the dog was much to energetic for the other pups I watch. In those situations I use my own harnesses and take them all for a nice long walk together. Usually when we get back they have bonded into a pack and get along great. In the rare instance that a dog seemed a bit aggressive toward one or more dogs I either used a crate if the pet parent brought or tether the pup to furniture where the pup could still be in the room with the other dogs but can't get to them. I would take that pup out quite frequently for a break. The other pups would stay a distance away when passing by the tethered dog. Then I decided if I want to take the dog again. A lot of times the dog just wants to socialize with other dogs and needs a lot of exercise. Otherwise you may have to keep the dog in a separate room. I hope it works out fine for you.

The others have already given good advice, so I will simply add by saying that you will need a way to host multiple dogs at the same time who do not get along. Sometimes they warm up to one another, but not always.

Invest in some baby gates or cross fencing for the back yard...something that will allow the dogs to enjoy their stay with you, but enjoy it in their own areas. We recently decided that we want to board dogs for a while, so we added a fence to our back yard that divides it into two play areas. It has saved us so much trouble!! Now we can let them out to potty one at a time, and each dog can run and play without stressing them out or risking a fight.

When you introduce your dogs, do so with both on a leash, and do little "hit and run" sessions. Bring them together for a quick body sniff, and walk off. Don't allow dogs to sniff nose-to-nose, at that is often a challenge and can lead to a fight. Take them for a walk together, or a similar activity that will get them next to each other without letting them get fixated and "obsessed" with the other dog. Another approach, place one in a wire crate while letting the other roam free in the same room. This works with certain personalities, but not all.

I'd advise (and I know from conversations that Rover completely supports) that you never agree to book a dog that you're uncomfortable with, but go ahead and meet the dogs. Yes, it can seem awkward to let the person know that you're not the right match for their pet, but that's why the meet & greet is highly encouraged to help you determine if you're matched. One way to do so is to say you're not the best match for the dog (rather than the dog is not one you want to care for - even if that's the case with a puppy or somewhat aggressive anti-social adult) and there are sitters who may have more experience with handling their needs and can make it a happier stay for the dog.

Holidays usually result in more requests than most sitters can accept, so you can choose the best match for you and your situation.