When dogs lick their lips while stressed, they might attempt to relieve these symptoms by cooling down their body or calming down their brain.
Rhythmic and repetitive lip-licking might be a sign that your canine is bored, happy, or looking for something to do.
You can’t generalize all types of lip-licking across dogs, but it’s typically a sign that they are irritated or angry.
By doing so, they attempt to increase their moisture content in the mouth. Additionally, it serves as a way for them to cool down the tongue, which can become too warm when dehydrated.
They do this because it’s a way to relieve themselves of excess saliva, which is a sign that they’re feeling queasy. This could be the issue, especially if they are also drooling and swallowing.