Havanese may not be the same color in adulthood as they were as a puppy. Most Havanese will experience a change in coat color around one year old, and some changes are more subtle than others. The color change in Havanese is due to genetics. Colors may darken, lighten, or change entirely. Black Havanese may end up silver and white, while dark brown dogs could turn lighter. Markings may appear or disappear. The changes may begin early in puppyhood, but aren't often finished until the dog reaches adulthood and has its adult coat. There is no way to know what color a Havanese puppy will be when it grows up, so reputable breeders recommend choosing a puppy based on temperament and leave color out of the decision making.
If two purebred Havanese carry the recessive gene for short hair, they may produce short haired puppies. If only one parent has the short hair gene, the puppies will have long hair but may still carry the short hair gene—which may produce short-haired puppies in future litters. A short-haired Havanese is usually able to be identified at a few weeks of age. When full grown, they have a short coat with feathering on the ears, tail, legs, and skirt.
While short hair in a Havanese is a disqualification in show as it is not within the breed standards, they still have the same temperament as the long-haired version, and are not prone to any additional health concerns.
Genetic testing is used to prevent breeding dogs with the short hair gene. Short-haired Havanese are called smooth-coated Havanese or Shavanese, but they are not recognized as a different breed. The Shavanese is not hypoallergenic because their fur is different—they shed their coat and their dander is different from long-haired Havs, which may cause more reactions in allergic people.