What causes dog underactive thyroid?

Related questions

1. Why do dogs put their bum in your face?
2. What will happen if hypothyroidism is not treated?
3. Does hypothyroidism in dogs cause itching?
4. What happens if hypothyroidism is left untreated in dogs?
5. Can aspirin kill a dog?
6. Does hypothyroidism cause aggression in dogs?
7. How can I tell if my dog has a thyroid problem?
8. Why is my dog always hungry?
9. Do dogs get full?
10. Does hypothyroidism cause panting in dogs?

Tags

1. #cause
2. #hypothyroidism
3. #risks
4. #disorder
5. #decrease
6. #thyroid
7. #hormonal
8. #gauge
9. #metabolism
10. #exact
11. #gland
12. #engine
13. #known
14. #little
15. #diagnosed
16. #common
17. #underactive
18. #produces
19. #hormone
20. #leading
21. #becomes