Breeds known to be affected include Rhodesian Ridgeback and Thai Ridgeback, in which it is hereditary, Kerry Blue Terriers, Shih Tzus and Boxers.

Lonely pig Paulinchen was luckily discovered moments from death and placed in the care of the surrogate mum Katjinga, an 8-year-old Rhodesian ridgeback, who gladly accepted it as one of her own.