Since you said they don't live that far away, I agree that the easiest option when going over to their house is to leave your dog at home and schedule breaks to go home to let her out. But since she does have anxiety issues, have you ever tried having her in your car as a "crate"? It was something my trainer suggested because it still smells like you, but isn't the house itself, and some dogs with separation anxiety handle being "crated" via car better than being left at home if you know you'll be gone a while.
If they're coming to you for any events/holidays, ask them to leave their dog in their car since it seems they're willing to do that much, but not willing to keep it leashed.
Ugh I might have to deal with around Christmas since we have a dog that pees when unsupervised, but we don't live that close to the relatives, so she may need to stay in the car for the visit.
If they're coming to you for any events/holidays, ask them to leave their dog in their car since it seems they're willing to do that much, but not willing to keep it leashed.
Ugh I might have to deal with around Christmas since we have a dog that pees when unsupervised, but we don't live that close to the relatives, so she may need to stay in the car for the visit.