Fleas are tiny insects that feed on a dog's blood, causing painful bites. Dogs bitten by fleas often scratch and chew at their bodies, leading to skin trauma.
Ticks are parasites that burrow into a dog's skin to suck blood. A tick bite often appears as a circular, inflamed area on the skin.
Skin mites, such as sarcoptic mange and demodex, cause fur loss in dogs. While their bites aren't visible, they can lead to intense itchiness or secondary bacterial infections.
Mosquito bites on dogs can appear as raised red lesions. While most bites don't need treatment, they can transmit heartworm disease.
Stings from bees, hornets, and wasps can cause significant pain and localized swelling in dogs.
Ant bites, especially from fire ants, can cause painful, pimple-like lesions on a dog's skin. Multiple bites can occasionally cause an allergic reaction.
Bites from flies like horse flies, deer flies, and black flies can cause red, raised lesions on a dog's skin.