Can I charge extra for constant accidents?

Rover policy is really clear that property damage is the sitter's liability.

Some dogs when away from home act in ways the owners can't predict (unless another sitter has told them). This is why so many people use baby/dog gates or an indoor playpen to restrict activity to a floor that is more easily cleanable, at least until it's observed that the dog can be trusted with more freedom to roam.

According to some threads on this board you may choose to look up, some sitters have successfully received some payment towards property damage (I'd guess in form of a tip) by nicely explaining the difficulties the dog had adjusting. Your boarding rate looks low so maybe they will give you something, but they do not have to give you anything .

Taylor, ugh, sounds like an awful experience! One issue is whether you're willing to risk getting a 1-star review and how much it's worth to you to avoid that. If you ask for cleaning costs, the owner can say "No" or "Yes" but either way, you're probably not getting a five-star review, and you might get no money AND a 1-star angry review that will sit at the top of your profile like a (forgive me) turd until you get more reviews.

If it were me I would chalk this up to experience: a house with no uncarpeted area a dog can be blocked off in probably isn't a great place to be offering boarding. It may be that for now, you're better off offering walks, drop-in visits, and housesitting instead of boarding, and when you have a place that is more conducive to sitting unpredictable dogs, you can start offering that service too.

Poor dog. He's a baby. Many sitters do not accept "babies" because of this. Great pyrenees dogs mature at age of 3! I can imagine when he was barking, he was telling you he needs to go to the bathroom. He is stressed out already. I can't believe the owners told you he can hold it for 8 HOURS!

But, if he pooped in your house, the chances are he will poop in the same spot again and again. Trust me, I am currently boarding a 2 year old dog, and he's peed inside 3 times today and pooped twice, and we were sitting outside and he ran inside to poop again (in the same spot).

Yes, it is no fun, I keep shampooing the carpets after each accident, plus after each dog. It happens. They're just animals, they don't know any better, esp when stressed out.

Yes, you are wrong. This is the part of being a dog sitter. Some dogs get nervous and can get diarrhea which will make them have to poop more. He may have been barking to let you know he had to go outside? Is he eating his own food? There are so many factors on why a dog would go to the bathroom more in a new environment than at home. I don't think the owner was trying to be sneaky, Its not the owners fault. You as the pet sitter need to be able to see a problem and come up with solutions or ideas to help fix it. Example blocking off the area the dog is able to have access to, lying down something to protect your carpet, ect. But wanting to charge the owner is not reasonable. At least you know that this would not be a client you would want to watch in your home again.