Love Border Collies
If we weren't in a rental we would have another like a shot
Have had 1.5 (one was a long term "loan")
The Loan had similar symtoms once when we had here but it was in conjunction with a bad gastro bug ... apparently this wasn't the first time ... following day she was OK but it was scary for a while ... overnighter in the vet.
I spose you would have commented if she had any other symptoms or ailments like this?
All the best