Vet explains why red bumps are showing up on dogs’ bellies

If you’ve ever noticed red, angry-looking circles on your dog’s belly, you might have panicked and considered an urgent trip to the vet. But before you rush out the door, there’s a good chance those marks are nothing serious.

A veterinary clinic in Alberta, Canada, recently shared important information on their Facebook page to reassure concerned pet owners. According to Morinville Veterinary Clinic, these red spots are often just fly bites—particularly from black flies—which, while unsightly, are usually harmless.
What causes these red bite marks?

The post from the Morinville Veterinary Clinic quickly gained traction online, as many pet owners were worried about similar markings on their dogs. The clinic explained that these are a type of fly bite that dogs commonly get from lying in the grass during the spring.

“They look terrible, but usually do not bother the dogs. They heal quickly on their own and do not require any treatment,” the clinic wrote.

The flies responsible for these bites—often black flies—are prevalent in North America, especially in northern regions. While their bites may appear severe, they typically do not cause pain or long-term harm to pets.

Michael San Filippo, a spokesperson for the American Veterinary Medical Association (AVMA), also confirmed that black fly bites are common and usually not a cause for concern.

“Bites from these flies on dogs are usually harmless,” San Filippo said. “But we’d caution pet owners not to ignore or downplay these kinds of bites, as there may be other causes that could indicate more of a threat to our pets.”

Should you be worried?

In most cases, fly bites heal on their own and don’t require medical treatment. However, pet owners should still keep an eye on their dog’s skin and overall behavior. If the marks persist, worsen, or cause discomfort, it could be a sign of a more serious issue, such as an allergic reaction or infection.

Veterinarians recommend checking for:
✔ Excessive scratching or licking at the affected area
✔ Swelling, pus, or signs of infection
✔ Other unusual symptoms, such as lethargy or loss of appetite

If your dog shows any of these signs, it’s best to consult a vet for a professional opinion.
A relief for pet owners

The clinic’s post was a welcome relief for many dog owners, who had been worried about the red spots on their pets. Some even shared their gratitude on social media.

“Thank you for the information. I was just getting ready to run out to the vet and spend a good $200 I really don’t have,” one Facebook user commented.

The bottom line

While fly bites can look alarming, they are usually harmless and clear up on their own within a few days. However, if you notice anything unusual—such as persistent irritation, swelling, or behavioral changes—it’s always a good idea to check in with your vet.

The best approach? Stay informed, monitor your pet’s health, and trust your instincts when something seems off!