You've found out your dog has allergies, and you are wondering how you can help! Connecting the dots and realizing certain foods or environmental allergens can cause your dog to have allergic symptoms is the first step in treating your furry friend. These allergies may come out of nowhere. Your dog may suddenly develop itchy skin, constantly scratching themselves. Other times, they may be red around their mouth right after they eat. Food allergies can also trigger symptoms such as inflamed and yeasty paws. You may start noticing your dog constantly laying down and licking their paws. In other cases, dogs may also exhibit stomach issues such as vomiting or diarrhea.