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Stumpy tail (Bobtail - Brachyuria) is a natural form of shortened tail in dogs. The trait occurs in some breeds: Welsh Corgi Pembroke, Australian Shepherd, Jack Russell Terrier, etc..

This trait is homozygous lethal. Dogs with two copies of the mutated gene die before birth.

The Sunshine mutation lightens the coat, mane and tail colour of the horse. It is visually very similar to the Pearl dilution and is located on the same gene as the Cream dilution factor. It was found in a horse of the cross breed Standardbred x Tennessee Walking Horse.