What Causes Hives on Dogs?

Wait… can dogs and cats actually get hives? They sure can! Hives, the fancy medical term is urticaria, are raised, red, swollen patches of skin that show up suddenly and, thankfully, usually disappear just as fast. They’re typically itchy and can pop up anywhere, though they tend to favor the back, neck, eyelids, flanks, and legs. Drama queens, these hives.

What’s Causing My Pet To Break Out?

Great question. The usual suspects include:

• Insect bites or stings
• Shampoos or grooming products
• Medications or vaccines
• Contact with certain plants or chemicals
• Food or environmental allergens, especially if hives keep making a comeback

Heat, stress, sunlight, exercise, or even friction can also play a role. In dogs specifically, hives can appear during estrus, also known as being “in heat,” or in puppies with intestinal parasites. So yes, the list is long, but your vet can help you play detective.

How Fast Do Hives Show Up?

Usually within minutes to a few hours after exposure to the trigger. In more serious cases, your pet might seem a little “off” at first, like low energy, not interested in dinner, or running a mild fever, before the hives even appear. Trust your gut if something feels wrong.

When Do I Actually Need To Call My Vet?

We’re so glad you asked. Reach out right away if:

• Hives appeared after a vaccine or new medication
• The hives aren’t fading on their own after a few hours
• You notice swelling around the face, throat, or mouth
• Your pet is having any trouble breathing

That last one is urgent. Hives alone are rarely dangerous, but a severe allergic reaction, called anaphylaxis, is a medical emergency. Don’t wait on that one.

Will They Just… Go Away?

Often, yes! Hives frequently clear up within a few hours all on their own. The catch? If the trigger sticks around, the hives will too. When treatment is needed, a vet may prescribe medication, such as a fast-acting corticosteroid, to help calm things down quickly.

My Pet Keeps Getting Hives. What Gives?

Recurring hives are your pet’s way of waving a little red flag. Chronic cases are often linked to environmental allergens, like pollen, dust mites, and mold, aka the usual annoying suspects, or food sensitivities. Your vet can help connect the dots and build a plan that actually works.

When Scout Pet Urgent Care Can Help

If your pet has hives, itching, mild swelling, or skin irritation, Scout Pet Urgent Care can help you figure out what’s going on and what to do next. We’re here for those “this doesn’t seem like the ER, but I definitely want someone to look at it” moments.

If your pet is having trouble breathing, has swelling around the throat or mouth, collapses, or seems suddenly very weak, head to an emergency vet right away.

Hives can be startling, but you’ve got this, and your vet’s got you. When in doubt, give them a call. Your pet will thank you, probably with zoomies.