Fleas can cause chewing of the feet and licking of the paws.
When a dog has been bitten by a flea they will sometimes lick and chew the paws because of fleas.
I very seldom see fleas on my dogs but get them in the bathtub and there they are.
Good grooming will eliminate lots of fleas and give your dog a respite from all that chewing and licking.Dogs who have fleas will lick and chew their paws
Sometimes a dog will lick just to give himself some comfort. It’s kind of like a person who is wringing their hands. It’s a comfort thing.
Give them a pat on the head and a dog cookie and see if you can change the behavior from licking to maybe playing with a ball.
I’ve seen lots of dogs licking their feet because of boredom. Play with your dog and give them lots of love even if they have fleas!