Carol,
We had a tire go 10 lbs low on us when we were in Blanco State Park over a weekend. Bob filled it up only to find that it had dropped 40 lbs in two weeks(the next time he checked them). He took it to a gas station to have it checked and they couldn't find a leak. We put the spare on and hoped that we would have a flat. He did as Glen and Lonnie suggested and soaped the entire tire and removed the value stem. It isn't leaking anymore, so I guess it was the value stem possibly blocked open by dirt.
Hopefully, the weather will start improving and you will be on your way soon. The pups look like the could get lost in that snow
I am sure they will be happy to be in warm weather too!!
Colleen