The single most effective thing you can do to help your paw licking dog is to use a cheap, warm steam vaporizer in the room where she sleeps. They cost $16 at any drug store.
Air conditioners can cause increased dog paw licking, dry, itchy skin, watery eyes, coughing at night, and overall restlessness in all dogs. When they remove heat from the air in your home, they also remove moisture as part of the process. If your dog already has allergies from inhaling tree and grass pollen, the air conditioner will make it worse.
The best thing you can do to help a dog who is licking her paws is to use a cheap steam vaporizer at night.
In the summer, tree and grass pollen can make dogs skin itch. But a huge factor is dry skin caused by dry air. When air conditioners cool the air in your house they also remove moisture. The condensation that's dripping out of that little tube is coming from the air in your house. Dry air can make your dog's skin dry enough to itch. And itchy paws cause dog paw licking.
During seasonal allergy flareups or if your dog licks year-round, a steam vaporizer can often solve 70% of dog skin itching problems with very little additional treatment.
If your dog is taking Prednisone or other steroid, Benadryl or other anti-histamine, a drug that combines both like Temaril-P, or you are using anything else, a warm steam vaporizer will radically improve the effectiveness.
Dogs with allergies or smaller dogs with little lungs will often develop a dry hacking cough that often starts in late evening and can go all night. A vaporizer will help immensely.
Small dogs will often get really watery eyes in the summer when the air in the house is dry from air conditioning and the air outside is full of pollen. Older dogs can have reduced tear production anyway, and when the air is dry their eyes can get really red and irritated. The discharge might get gummy or even infected during the summer when pollens are the worst and the air conditioner takes all the moisture out of the air. If you have a little dog with tear stains, the best thing you can do is use a vaporizer at night, especially if your dog is getting older or you've noticed the stains are getting worse.
So if your dog licks his paws, or coughs at night, or has dry eyes or decreased tear production, or just seems restless, spend $16 and try a warm steam vaporizer for a few nights to see what happens. You will be pleasantly surprised, and so will your dog.