It is hard to know for certain if there is a food allergy for people who are not familiar with the details of this condition. For dogs, owners must get familiar with the common symptoms including belly itching, skin infections, limb chewing, recurrent ear infections, and facial itching.
Dogs are usually provided with packaged food for their everyday nutrition. These will contain a wide variety of ingredients including coloring, fillers and proteins. A lot of pets develop allergies after consuming commercial dog food. The incidences are higher than one might expect. The skin and the GI tract are the most commonly affected parts.
Owners must keenly observe their dogs for clues to help them in case something is wrong. If the pet exhibits unusual behavior such as scratching itself continuously after eating, then a food allergy may be listed as a possible cause. Of course, other issues must also be considered including fungal infections.
Incidences of allergic reaction to wheat and corn are frequent. The records do show that the level of reaction can vary widely. These can have minimal effect on some dogs and be quite problematic on others. Be sure to check the labels so that you know exactly what your pets are consuming. Excessive coloring must also be avoided.
Another behavior to watch out for is hyperactivity. This has often been linked to food allergies. Dogs can become restless due to the discomfort causing them to behave in odd ways. Aside from coloring, high fat and preservatives can also trigger allergies. If their conduct changes after a shift in diet, then further investigation is warranted.
Note that other digestive issues and other illness might be at play. Make consistent observations before, during, and after feeding to make sure that it is really their food that is causing problems. See if there are any links to their symptoms and the ingredients listed on the label.