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Dwarfism is not just a tiny dog. If the Dwarfism is caused by the pituitary gland will result in a dog that retains their puppy coat, experiences thinning hair and eventually loses their hair, the skin will darken, their adult teeth may not come in, and they will have immune system problems and severe joint problems. It is hereditary and the mother and father should not be used for breeding again. It it also recommended that none of the littermates be used for breeding either because they may be carriers. These dogs will not live a full life. The only treatment is human growth hormone which is expensive, may not be available to your vet, and the success rate varies.