I took Bella, 12wk old female to the vet for her 3rd round of boosters and noticed her lower lips and were soaked with saliva. She was also whining alot on the ride. The vet said she looked very healthy and he thought it was probably excitement. That was 2 days ago and she' s still salivating like crazy, soaking the carpet, or anything else she lays her head on. I have notice when I let her out of the kennel in the morning she scratches at her lower lips and chin. She acts and looks normal other than the scratching. Her appetite has not changed, no swelling to be seen. I have looked her over for stings and bites and can find nothing lodged in her mouth. But it does seem to be bothering her. Other than drinking a little more, nothing has changed. Any help?