Skin allergies in dogs might be at the front of your mind if your dog is constantly itching and scratching. If this is the case, you’re in the right place – my guide will cover everything from symptoms to treatments.
Home remedies and over-the-counter medicines are popular among pet parents but they aren’t always effective. We always recommend working with your vet to get a proper diagnosis and steps to help your dog feel better.
Sometimes it is a matter of switching to one of the best dog foods for allergies or figuring out if there other environmental causes to your dog’s allergies. Either way, read on for an in-depth look at skin allergies and what you can do to help.
What causes skin allergies in dogs?
Like humans, dogs can have allergies to foods, environmental allergens, or both. Both food and environmental allergies can result in cutaneous (skin) reactions.
Food allergies
Food allergies in dogs, better defined as an “adverse food reaction”, is an abnormal response to the ingestion of a particular food or food additive. The body incorrectly identifies the food molecules as an antigen, or a threat, and mounts an immune response against them, leading to symptoms like itchy skin or diarrhea.
Food allergies most often develop after prolonged exposure to one type of food. In dogs, the most common food allergens are beef, chicken, lamb, and wheat. Allergies to soybean, milk, eggs, corn, walnuts, and possibly peanuts have also been reported.
Dogs that have developed an allergy to one type of food may also develop allergies to additional foods in the future.
Environmental allergies
Environmental allergies result from a defect in the skin’s epidermal barrier, which is thought to be due to a combination of genetic and environmental factors. These epidermal barrier defects allow allergens such as pollen to penetrate the skin surface and bind to immune cells, triggering an inappropriate immune response.
This results in an inflammatory process that leaves the dog itchy, red, and uncomfortable. Common allergens in dogs include pollens, grasses, dust mites, molds, and dander.
Symptoms of skin allergies in dogs
Food and environmental allergies look very similar and are impossible to distinguish by symptoms alone. The common symptoms of allergies in dogs include:
- Chronic itching
- Recurrent skin or ear infections
- Hair loss, redness, and crusting of the skin
- Self-trauma such as scabbing, hair loss, and saliva staining
- Frequent scratching or excessive licking
Other skin conditions can also cause similar symptoms, so if you suspect your dog may have allergies, it’s important to see your veterinarian first for a diagnosis and appropriate treatment.
Your veterinarian will perform a full head-to-tail physical examination and may recommend some additional testing such as a skin scraping or sampling from your pet’s skin. Once the underlying cause of your pet’s itching and discomfort has been diagnosed, your vet will be able to develop an appropriate treatment plan to help get your pup feeling better.
How to treat skin allergies in dogs
Treating food allergies
Food allergies are both diagnosed and treated using an elimination diet trial. Your dog will be put on a special diet for a minimum of eight weeks. This diet may be a limited ingredient, novel protein, or prescription hydrolyzed diet. Your dog must eat this food and no other food, treats, table scraps, or flavored medications for a minimum of eight weeks.
If your dog’s skin symptoms resolve during the eight-week trial, then this is diagnostic for food allergies. Your dog will need to stay on a special diet for life to avoid the ingredients that he or she is allergic to.
Managing environmental allergies
Environmental allergies are more difficult to manage because your dog can’t avoid pollen or dust. Environmental allergies are typically managed with prescription allergy medications.
These may be given in the form of daily pills or monthly injections. Some dogs with environmental allergies may also benefit from immunotherapy injections, where they are exposed to low levels of the allergens they are allergic to and thus slowly desensitized to them.
Your dog first must have an allergy test to determine which environmental allergens he or she is sensitive to, and then your veterinarian can special order the injections for your dog.
In both cases, your dog may also need to be treated for any skin or ear infections that have arisen secondary to the allergies. Ear infections are typically treated with topical medications, such as medicated ear cleaners or topical ointments. Skin infections typically require oral antibiotics to treat.
Your dog may also need a course of steroids or prescription allergy medication to help reduce the itching and inflammation associated with these skin infections. Treating the underlying infection will help improve your dog’s itching and also make your dog’s allergies more responsive to treatment.
Can skin allergies in dogs be prevented?
Unfortunately, because allergies are caused by genetic and environmental factors, they cannot be prevented. We can only manage allergies as they occur. We can prevent flare-ups of allergies by avoiding the offending allergens, such as by feeding a prescription diet to prevent food allergy flare-ups or minimizing dust in the home to reduce environmental allergies.
Although allergies cannot be truly prevented, we do know that there is a genetic component to the development of allergies. This means it is best to avoid breeding dogs with allergies to avoid passing on this condition to the next generation of puppies.
Want to learn more? Read our guide to skin conditions in dogs and common allergies in dogs
Alexis is a Digital and Syndication writer for PetsRadar and she produces everything from our listicles to buying guides, features, and deals. Growing up with cats, dogs, and fish, Alexis brings her own personal experience and knowledge to the content she writes.
Originally from the United States, Alexis graduated from Bowling Green University with a Bachelor of Arts degree with a concentration in English Language and Literature. She began her editorial career working as in Editorial Intern at Ohio Magazine and fell in love with lifestyle journalism.
Alexis has also worked for titles across the UK including Daily Mail, Space.com, and Black Women Rising Magazine.
Alexis works hand-in-hand with qualified vets to bring accurate and helpful information to pet parents and is passionate about creating content that will not only support pet parents but also offer them an enjoyable read.
Edited by Megan Milstead and Georgia Guerin.
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Last updated March 25, 2025.
