In-depth guide to anal gland problems in dogs — from impaction to adenocarcinoma and their welfare implications.
Anal gland disease causes a spectrum of welfare impacts. Simple impaction — the inability to naturally express anal sacs during defecation — causes chronic perianal irritation and discomfort. The classic scooting behaviour reflects this discomfort. While scooting looks comical, it indicates genuine perianal itching or pain that impairs quality of life if not addressed.
Anal sac abscess is an escalation to acute severe welfare impairment. The infected anal gland swells, causes intense perianal pain, and eventually ruptures through the perianal skin. The rupture provides some pain relief but leaves an open wound requiring wound care and systemic antibiotics. The period before rupture involves significant suffering.
Anal sac adenocarcinoma is the most serious welfare concern. The tumour frequently causes hypercalcaemia (from parathyroid hormone-related protein secretion) even before local signs are apparent. Hypercalcaemia causes polydipsia, weakness, vomiting, and renal damage. Surgical excision with lymph node removal, followed by chemotherapy and radiation, offers the best welfare-extending treatment.