Pete the Vet: My dog is licking his paws - is he stressed?

Paw licking can be a distraction that dogs do when they are bored or anxious

Pete the Vet: 'Paw-licking has absolutely nothing to do with missing nutrients, but it can sometimes be linked to stress.'

My dog is licking his paws. He does it calmly and almost languidly, usually when he's chilling out on the couch with us. However, my friend told me this is a sign the dog is stressed and I should look at his diet to see if he's missing nutrients. Is this true? What could he be missing in his diet? 

— Gillian, North Cork