- MaxiLv 76 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 66 months ago
grooming itself normally
- PearlLv 76 months ago
maybe he caught it from another dog
- Barkley HoundLv 76 months ago
He must lick his fur.