It seems a lot of our bulldogs have seasonal allergies or food allergies. Foot chewing is the first sign and can make the dog very uncomfortable. This is what I have done to reduce foot irritation and make Vicki more comfortable during allergy season and when she was recovering from a food allergy. It did wonders!
If your dogs' feet are red and itching from playing outside (you should observe if they are chewing their feet more when they come in from walking or play), before you bring them in, hose paws off thoroughly (or rinse inside if you live in an apartment or don't have a hose) and keep them nice and dry. This is especially important if you take them out in the morning or on humid days when the grass is moist and dewy. I noticed Vicki's feet get a little worse in these conditions.
Once a day, lather the dog's feet up with antibacterial hand soap (make sure you are using a soap that doesn't have an off the chart amount of alcohol in it, like some dollar store brands) and dry thoroughly.
To preven infection, use an antifungal spray like Malaseb spray for dogs and horses. You can get it here
. You may want to shop around and price compare...this site was cheaper for me than my vet.
Make sure you take you dog to the vet if the problems persist or get worse and you need to get an allergy test to determine the cause of the problem.