Dog food allergy symptoms aren't specific which makes it hard to diagnose food allergy by just looking. Dogs that suffer from an allergic immune response can exhibit different symptoms.
The most important sign is an itch, which is not bound to a particular time of year. When your dog's skin is itching he will be excessively scratching, licking his feet, rubbing his skin against surfaces, etc. You can also see skin infections, hair loss and repeating ear problems.
These include vomiting and diarrhoea. It seems that dogs with a food allergy have increased bowel movements up to twice the amount of non-allergic dogs.
Breathing problems, sneezing, sporadically your dog could show signs of asthma.
These symptoms are general for dog allergies and it is not easy to determine whether your furry friend is suffering from a food-induced allergy or another type of allergy (such as for instance contact allergy or inhalant allergy).
In this picture you see the skin of a Labrador Retriever who was suffering from both dog food allergies and multiple contact allergies.
And another complicating factor is that your dog may have BOTH: a food-induced allergy next to atopy or dermatitis. Therefore it is important to rule out other causes or to treat these upon diagnosis.
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