Excessive swallowing can also be a sign of nausea.
Just a note too: A dog cannot lick their nose or snout without swallowing.
A good rule to follow if you have trouble getting them to swallow a pill...after depositing a pill down their throat, tap their nose with butter, peanut butter, cream cheese or coolwhip..really does not matter, and they will instantly lick their nose forgeting about the pill and swallow. Even a drop of water on the nose works.
I still think this may be due to nausea though...only your vet can say for sure.
Be The Kind Of Person Your Dog Thinks You Are.