- MaxiLv 79 months agoFavorite Answer
When your dog grooms itself each time a small amount of its hair is swallowed and the more loose hair they swallow eventually these will form into a ball....... you grooming your dog to remove the dead coat daily will stop it happening again
- VeschengroLv 69 months ago
grooming itself normally
- PearlLv 79 months ago
maybe he caught it from another dog
- Barkley HoundLv 79 months ago
He must lick his fur.