In reply to blackcat:
Patterdale MRT searched the area on Sunday, then were involved in an actual rescue in the same area on Monday. They have found no evidence of a dog in that area.
To be honest, there is a kennels at the bottom of the dale, and the dogs there are always howling. On a very still day such as we had on both days over last weekend, you can easily hear them right up to the top of the valley.
It seems very likely that the dog heard was from the kennels.