What does it mean when a dog sleeps curled up?

Related questions

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Tags

1. #where
2. #abdomen
3. #would
4. #gruen
5. #vulnerable
6. #organs
7. #protects
8. #conserves
9. #vetstreet
10. #sleep
11. #especially
12. #gives
13. #predators
14. #their
15. #tucking
16. #warmth