Page 2: Bacterial and Parasitic Culprits
3. Bacterial Folliculitis: The “Crusty Circle” Mystery
This is a term that sounds intimidating, but it is one of the most common reasons for small scabs on dog. Bacterial folliculitis is an infection that starts in the hair follicles. It usually begins as a small red bump—essentially a doggy pimple or pustule. When that pimple pops or the hair follicle dies, it leaves behind a small scab.
As the infection spreads outward, it creates a circular pattern of crusty, flaky skin. In my experience, owners often confuse this with ringworm because of the circular shape, but in dogs, these “epidermal collarettes” are almost always bacterial. Folliculitis is rarely a “primary” problem. It usually happens because something else has weakened the skin’s natural barrier. If your dog has been dealing with how to settle a dog’s upset stomach, their immune system might be lowered, making them more susceptible to these skin infections.
4. Mites and Mange: Sarcoptic vs. Demodectic
If the small scabs on dog are accompanied by intense, “stop everything and scratch” itching and hair loss, we have to talk about mites. There are two main types that cause scabbing in dogs that every owner should know about:
Sarcoptic Mange (Scabies)
This is highly contagious (yes, to you too!) and incredibly itchy. The mites burrow under the skin, causing severe inflammation and tiny, crusty scabs. You will usually see this on the elbows, ears, and belly first. If you rub your dog’s ear flap and their back leg starts scratching frantically, it’s a strong indicator of sarcoptic mites.
Demodectic Mange (Demodex)
Unlike scabies, these mites live on almost all dogs naturally. They only cause a problem if the dog’s immune system is weak. This usually isn’t as itchy as scabies, but it causes scabs, “oiliness,” and hair loss that makes the dog look a bit moth-eaten. It is very common in puppies whose immune systems are still developing and can’t keep the mite population in check.
5. Environmental and Food Allergies: The Itch Cycle
Allergies are the “great imitators” in canine dermatology. Whether it’s a reaction to pollen, grass, or a specific protein in their food, the result is often the same: inflamed skin. When a dog has allergies, their skin becomes “leaky” and itchy. The dog scratches, creating “micro-tears” in the skin. These tears become infected by the bacteria normally living on the surface, leading to small scabs on dog.
Environmental allergies (Atopy) usually follow a seasonal pattern. If your dog gets scabs every spring or fall, they are likely reacting to something in the air. Food allergies are less common but more persistent, often causing scabs on the face, paws, and ears. If you suspect a food issue, it’s a good idea to audit your home for common household items toxic to dogs that might be triggering a systemic flare-up.
