DCHP-1 Online
ice-ball 
n. a ball-like bit of ice that forms on the paws of sled dogs, under the hooves of horses, etc.
- 1931 . . . whilst the dogs take the opportunity to bite the ice balls off their feet.
- 1956 Meanwhile, the dogs are down, chewing at the ice-balls between their toes.
- 1931 . . . whilst the dogs take the opportunity to bite the ice balls off their feet.