Adrienne is a certified dog trainer, behavior consultant, former veterinarian assistant, and author of "Brain Training for Dogs."
Urticaria is the medical term used to denote the presence of hives, welts, or wheels on a dog's skin. The skin rash presents as uncomfortable raised, red, itchy bumps. The welts can be localized on the dog's head, legs, belly, or back, or they can be widespread all over the dog's body and may come and go. Some dog owners describe the welts as dime-sized bumps on the dog's skin.
While there are many causes of welts in dogs, they often tend to result from an acute (arising suddenly) allergic reaction. A common culprit can be vaccinations, which is why vets often recommend keeping an eye on the dog for the first few hours after receiving shots. Other causes are from allergic reactions and exposure to certain types of plants, insect bites, household chemicals, medications, foods, and even stress. In some cases, the presence of welts may be indicative of other medical conditions. This article will focus on welts triggered by allergic reactions.
Insect Bites or Stings
Food and Medication
Misc. Environmental Allergens
When it comes to allergic reactions, welts can form when there is direct contact with an irritant. In this case, it's called "contact dermatitis," and the allergic reaction is mostly localized to the area that came in contact with the allergen. The welts or rash will, therefore, often show up on the dog's feet and the belly area if the dog happens to lie down on the trigger. Inhaled allergens such as grass pollen, dust mites, or mold can also cause welts, as well as insect bites. Sometimes, the actual trigger may be difficult to pinpoint and the underlying cause of the welts on the dog's skin will remain a mystery. A veterinary dermatologist may test for some common allergens, but the process can be costly and challenging at times.
One concern about welts is that they can sometimes be accompanied by swelling of the lips, nose, and eyes, which is medically termed angioedema. The eye swelling may be so severe that a dog cannot open its eyes, and these cases may require antihistamines and injectable steroids. Serious cases may also spread to the throat (laryngeal edema), which can block the dog's airway and lead to anaphylactic shock. Other accompanying symptoms may include:
In an emergency situation, time is of the essence. According to the Merck Veterinary Manual, dogs can die from anaphylaxis within minutes. These dogs need immediate veterinary attention which typically requires a shot of life-saving epinephrine. For those curious to know, yes, they do make epi-pens for dogs!
Respiratory distress can occur if the angioedema involves the nares, larynx, or pharynx.
— Karen A. Moriello, DVM, DACVD
In order to address welts in dogs, the underlying allergy needs to be pinpointed. Benadryl is an antihistamine that blocks the release of histamine and can help provide relief. According to veterinarian Dr. Christine M.:
Plain Benadryl (diphenhydramine) can be given at a dose of 1 mg per pound of body weight every 12 hours until the dog's symptoms are gone.
It's always best to consult with a veterinarian before giving Benadryl to dogs and to discontinue its use if the dog shows behavior changes such as excitement or lethargy. Benadryl should not be given to dogs suffering from glaucoma. Other prescription medications include Claritin (loratadine) and Atarax (hydroxyzine), which are to be given under the guidance of a veterinarian.
For severe reactions, steroids are sometimes given as a shot or as an oral medication (i.e., prednisone), but these drugs can have uncomfortable or severe side effects at times and suppress the immune system. In some cases, the dog may develop welts again once the steroid is out of its system.
Antibiotics for Secondary Infections
When dogs have rashes, the constant itching and scratching may cause lesions and secondary bacterial or yeast infections; this may require a course of antibiotics. A veterinarian will need to diagnose these secondary skin conditions by analyzing a skin sample under the microscope. The infections are often treated with antifungal or antibacterial shampoos such as chlorhexidine shampoo for bacterial infections and Malaseb shampoo (an antifungal).
This article is not meant to be used as a substitute for veterinary advice. If your dog has welts, please see your veterinarian.
Question: What does a welt look like on a dog?
Answer: Welts in dogs typically appear as raised areas of the skin varying in shape and size. They are often itchy.
Question: How long does it take for welts to fade away on a dog?
Answer: This depends by a variety of factors such as how severe the reaction is, whether the trigger is still around (is the dog still exposed to it? It's hard to say if the trigger remains unknown) and whether medications are given. Some dogs have them just for several minutes, others for hours and some for several days.
Often, Benadryl is not enough to control hives in dogs, and stronger meds such as prednisone are needed. Please see your vet for proper treatment. Sometimes welts may progress and cause trouble breathing which may turn into a life-threatening situation.
Question: We have tried so many things with our puppy. He is 4 months old and has had hives for 7 weeks now. What else can we do for our puppy's hives?
Answer: Have you seen a board-certified dermatologist? If you have had repeated vet visits and got you nowhere, have tried medications, food trials etc. it may be time to see a specialist who has made of skin problems the area of specialty.
© 2016 Adrienne Farricelli
ccrow on August 19, 2020:
"...presence of hives, welts, or wheels"
I think the word you're looking for is 'weals'.
Tina6969 on August 04, 2020:
My pits have allergies, (pitbuls),... I have been in business for animals for 33 years. The best thing is benadryl. 1mg. Per lb. Of your dog is the best, but they need to hve breakfast 1st.... If that is not working within an hour, and your animal is acting weird... Get them to E.R.!!!!
Don't take the chance of death.
You know your baby.
Don't listen to noone else.
And stay sfe peeps!
Harley C. on July 20, 2020:
Our dog started with welts and we're thinking it's her new "luxury" dog bed from Costco. It's been washed with non-perfume/dyes detergent but she still has welts maybe from the fibers or filling? The bumps clear up after her bath but return the following day. We're experimenting now to see if it really is the bed (it was an expensive bed) or maybe her food.
Lin on June 07, 2020:
My dog has had allergies for years, just recently I was told he needed a L.I.D. went on that and the hives and itching gets worse. The food he was on we did not have hives but we had issues with licking and chewing feet...frustrating.
Nathan Davis on November 28, 2019:
Adrienne Farricelli (author) on June 02, 2019:
Linda H, this can be quite frustrating to deal with. There are so many possible causes it can be overwhelming. Plastic food bowls, chemicals on the floor, laundry detergent used to wash bedding, ingredients in foods are just a few examples. Sometimes, vets (and human doctors too!) find it easier to give meds to control the welts than try to pinpoint the exact cause.
Linda H on May 30, 2019:
I have 2 boxers, one is having raised bumps in the morning. The bumps go away for the day but returns the next morning. I haven't changed anything. Any suggestions.
Firsttimemom on December 13, 2018:
Thank you soooo much this is what i wanted to read!
Art on October 23, 2018:
My dog has all the symptoms mentioned regarding allergies. Steroids is you’re only hope. Not even a vet can figure it out. They prefer not to give steroids however it’s they only alternative. Anything else is a waste of money and time.
Jackie Karp on September 12, 2018:
Will coconut oil help with a million. Bumps that are bleeding
Amanda norton on July 29, 2018:
Last night our indoor dog came in my room with really red eyes and swollen bumps all over him?? He’s terrified of storms could it be his nerves??? He’s never done this in the past??
Marisell on April 28, 2018:
My yorkie has bumps all over her body, the grass is high and she had a ant in her coat when I bathe her last nite
Gina Auton on September 15, 2017:
SOO HELPFUL THANK YOU
Jenny on February 21, 2017:
Thank you. Helpful article!
Adrienne Farricelli (author) on June 05, 2016:
Thanks all! This is important information to be aware of as dogs can be prone to allergic reactions and welts in dogs may not be readily identified as they look different than welts in humans.
Devika Primić from Dubrovnik, Croatia on May 31, 2016:
I like the way you write about our friendly pets. Informative and always useful.
Karen Hellier from Georgia on May 30, 2016:
Interesting article. I have never noticed welts on my dog's body but she is 11 and has had hot spots and fatty tumors. Thanks for this information though. Very thorough article.
stella vadakin from 3460NW 50 St Bell, Fl32619 on May 30, 2016:
Very interesting article and good advice. I have always used benadryl for my dogs. I am lucky my smaller dogs do not seem to get much of anything.
There is no one fits all prevention for a dog rash on belly. Your vet can outline a plan for your dog’s specific circumstances to prevent recurring issues.
Baths help with many skin conditions. Regular baths remove contact allergens from your dog and offer an opportunity to inspect your dog for rashes. Additionally, you can help improve your dog’s coat by using a dog-safe leave-in conditioner. This prevention can, in turn, prevent certain skin conditions on your dog.
Additionally, you should look into the balance of fatty acids in your dog’s diet. Hill’s Pet points out that fatty acids support both a healthy coat and skin. If your dog’s food does not provide a sufficient dose, you can supplement it. A good example is fish oil, though you should check with your veterinarian about appropriate dosing.
Question what to do once the itchy is not as much. I want to know what to do for the scabs their isn’t any swelling or fluid. My dog will be groom in a couple days will tell his groomer about the scabs. Please help will be very grateful. I dearly love my purebred Shih Tzu Messiah. Dixie
Should not be taken for grooming …
What is good for healing scabs on my dog?
Hi Kathy antibacterial cream and medicated shampoo is good I have a German Shepherd and I used both on him and it worked well also don’t over groom your dog they should be only bathed once a month..it is very common to happen to long haired dogs!! All the best..Paula
My dogs scabs turn a brownish scabby color butwhen i.put athletes food cream plus cortaid they clear up and start omewhete else. He licks and wakes me up in the night by shaking and licking
So my lab every spring season gets lumps bumps and crusty scans around top of head and onnouyside of ears side of face. Is this from some weed or plant. What can I do for him?
I dont know but my lab gets the same symptoms but alwasin late summer to early fall. It last for at leastmaking a month and gets to the point of making him look really bad.
Is vitamin e oil good to put on dogs scab?
My Yellow Lab has black color skin around her vulva lower stomach area that looks like dirt but does not come off with washing. Sometimes I can scrape it off with my nails but sometimes not.
My vet says it scar skin from being in a shelter and not being treated for her skin allergies. I have her on Apaquel and Allergy shots.
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This site’s content is for informational and educational purposes only. It is not intended to serve as medical advice or to take the place of advice from, or treatment by, your veterinarian. You should always discuss treatment of medical conditions with your veterinarian before using any alternative therapies, natural supplements, or vitamins.
As described above, hives appear as small, round, raised bumps on the skin of the face and other parts of a dog’s body, such as the legs and the abdomen. The hair over the bumps stands up and sticks out in small patches.
There may be swelling and itching, so your dog may scratch and lick the affected area.
If the face (especially around the muzzle) is swollen, the dog may start drooling.
In severe cases, hives may cause swelling in the throat, making it difficult for the dog to breathe and swallow.
Although hives are generally not life-threatening, there are exceptions.
For example, if your dog has a swollen face and has difficulty breathing, this could be dangerous. Be sure to take him to the vet immediately! It’s an emergency!
You should also take your doggie to the vet if the hives do not disappear in 48 hours.
Any of the following can produce welts or hives on the skin: