It usually lies flat against the belly. The Golden's coat should never be too long, as this may prove to be a disservice to it in the field, especially when retrieving game. Golden Retrievers have mild feathering on the backs of their fore legs and heavier feathering on the fronts of their necks, backs of their thighs and the bottoms of their tails. Eye diseases are also possible in the breed; cataracts are the most common eye disease, but they can also be afflicted with progressive retinal atrophy, glaucoma, distichiasis, entropion, corneal dystrophy, and retinal dysplasia.