I'd suggest you upgrade his food. Even if it doesn't solve the foot licking problem, it will vastly improve his overall health. Orijen, Acana, Taste of the Wild, Evo, etc. are all good. You can go to Dog Food Analysis - Reviews of kibble
and compare brands. Pedigree, Eukanuba and Iams are very poor quality foods with lots of grains, corn, and fillers. All these ingredients can cause or complicate allergies.
If you want a superior diet, you could try ZiwiPeak or even a raw diet if you are interested.
That would be my first suggestion.
As for the boredom, etc..... how much is he exercised? I'd make sure he got a long walk before you go to work and another one when you get home. Lots of vigorous playtime so that he is busy in the evenings. You can do puzzle toys like buster cubes or stuffed kongs also.