Companion Animal Thyroid Disease Welfare

Thyroid disease is common in older companion animals, causing systemic welfare impacts that respond well to treatment. Early recognition and management protects quality of life.

Key Facts

Hypothyroidism is the most common endocrine disease in dogs, affecting 1 in 100
Hyperthyroidism is the most common systemic disease of older cats, affecting 10% of cats over 10
Hypothyroid dogs gain weight, become lethargic and develop skin and coat problems
Hyperthyroid cats lose weight dramatically despite voracious appetite
Both conditions are highly treatable with excellent welfare outcomes when managed early

Welfare Considerations

Thyroid disease is among the most treatable causes of welfare deterioration in companion animals. Hypothyroid dogs experience gradual decline in energy, coat quality, thermoregulation and neurological function that owners often attribute to normal ageing rather than disease. Correctly diagnosed and treated with twice-daily thyroxine, they experience dramatic welfare improvement within weeks. Hyperthyroid cats live with a permanently over-revved metabolism causing weight loss, hypertension and cardiac stress until diagnosed. Treatment by medication, radioactive iodine or surgery restores normal metabolism and welfare.

What You Can Do

Screen dogs annually for hypothyroidism from age 7 especially in predisposed breeds
Request thyroid hormone testing at annual health checks for cats over 9 years
Monitor for clinical signs: weight changes, activity changes, coat/skin changes, thirst
Begin treatment promptly on diagnosis - both conditions respond rapidly to appropriate therapy
Follow monitoring protocols: thyroid levels should be rechecked 4-6 weeks after starting treatment