Yes, I wish we could, to warn other sitters. Is it against any rules if we did do that, like on here or somewhere else?

I just had a dog stay with me 2 days ago and he was terrible! The owner wasn't able to make a meet and greet work due to work schedule, but I figured it'd be fine since it was only for 1 night. As soon as they came to my house his dog peed on my front door, while still on the leash, in the owner's hand. And only then did he tell me that he'd had another sitter tell him that his dog liked to mark his territory all over the house because there was a dog living there. I have a dog too, so...Aside from that, he said the dog was house broken and not aggressive at all. I let the dog out every house or so and even then he peed all over my laundry room. I had to put him in a crate at night so he wouldn't pee on anything and he got very aggressive when I tried putting him in there. I had to have my boyfriend do it and the dog even snapped at him. Now I'm kind of debating if I even want to be a sitter anymore after that experience...