How to Identify Dog Skin Problems
📝 Summary
Dog skin disease is common and has many causes. The big three are external parasites (fleas, lice, ticks), mange mites (demodectic and sarcoptic), and allergies (acute or chronic) — each with distinct signs, and a vet confirms mites or infection under the microscope before you treat.
1 External Parasites
Fleas, lice, and ticks are the usual external parasites. They bite, drink blood, and cause itching and a rough, tangled coat; severe cases lead to whole-body hair loss, weakness, and anemia, and their saliva and waste trigger allergic dermatitis — plus they carry other diseases.
Diagnosis: live parasites on the body, flea dirt and lice eggs at the hair roots, and sudden itching, licking, or whining.
2 Mange Mites
The common mite types are Demodex and Sarcoptes. Infection shows as red, swollen follicles, pustules, and hair loss, starting around the eyes, muzzle, and lips with little itch at first, then spreading to the neck, limbs, belly, and inner thighs — redness, hair loss, greasy seborrhea, scaling, small abscesses, itching, thickening, and pigmentation.
Diagnosis: combine clinical signs with a skin scrape examined under the microscope — seeing mites and larvae confirms it.
3 Allergic Reactions
Allergies split into acute and chronic. Acute ones appear right after an oral or injected drug or a sensitive protein: facial and limb swelling, whole-body hives and itch, and in severe cases rapid breathing or even shock and death. Chronic ones show as red bumps, hives, itching, and hair loss, sometimes with chronic ear inflammation (red, weepy ears) plus vomiting and diarrhea.
Many other causes exist beyond these. Do not blindly medicate an undiagnosed case — safer supportive care beats the risk of wrong treatment.
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