@wyattwrd Not only is it a puppy who was probably extremely excited, but in general it’s not uncommon for dogs especially at a young or puppy age, to have accidents in new places.
Dogs typically don’t want to potty where they live and sleep, but in the beginning they don’t und that your whole living space is there home. At first they understand the crate is there home, then maybe the living room, but it may take awhile for them to understand that the whole home is their home.
When dogs get potty trained in the beginning they don’t go in the house, not because they understand that going potty inside is wrong, but because they grow to understand the whole specific space is a no potty zone.
Therefore it can be difficult for young inexperienced dogs to generalize that ANY indoor space is a no potty zone because to them a new space isn’t where they live so why not potty there. That combined with being excited probably caused the excessive accidents.
My recommendation would be to practice taking your puppy to other peoples homes and when go, take your puppy out every 30 minutes like they aren’t potty trained to help them generalize that all indoors is a no potty zone.
On a side note, any sitter who supposedly deals with puppies should be semi aware of this. If not the exact dog psychology at least be aware that potty trained puppies often have accidents in new places, and should have probably expected/been prepared for this. Granted 11 is a lot but still I find this questionable.