why is my dog itching so much?

Excessive itching in dogs, known as pruritus, is a common symptom with multiple potential causes. The most frequent culprits include parasites like fleas and mites. Flea allergy dermatitis (FAD), caused by an allergic reaction to flea saliva, can lead to intense itching even from a single bite. Mites, such as Sarcoptes scabiei (sarcoptic mange) or Demodex canis (demodectic mange), also cause severe discomfort.

Allergies are another significant factor. Environmental allergies (atopy) react to pollen, dust mites, or molds, often presenting seasonally or year-round. Food allergies, typically to protein sources like beef or chicken, can cause non-seasonal itching, frequently affecting the ears, paws, and face. Contact allergies are less common but can occur from irritants touching the skin.

Skin infections, either bacterial (pyoderma) or yeast (Malassezia dermatitis), often develop secondary to allergies or other skin barrier issues, exacerbating the itch-scratch cycle. Other less common causes include dry skin, hormonal imbalances (e.g., hypothyroidism), autoimmune diseases, and even behavioral issues like anxiety, leading to psychogenic pruritus.

**Warning**: Persistent itching requires veterinary attention. Self-diagnosing and treating can delay proper care, leading to worsening conditions, secondary infections, hair loss, and chronic skin damage. A veterinarian can perform diagnostics to identify the underlying cause and recommend an effective treatment plan.