Belton spots are colored spots on a horse's white markings. They are unrelated to cat tracks on tobianos. Belton spots are a type of occluding spot. They have been found to be genetic in some way. There are a couple of Chincoteague families that appear to have belton spots.
Bend Or Spots
Bend Or Spots, also known as grease spots or smuts, are random dark spots on color. They can appear on any color, but do not appear on white. They can be present at birth or develop as a horse ages. The inheritance of Bend Or spots is unknown, however in some cases it does seem to run in families. The name Bend Or comes from a Thoroughbred of that name.
Birdcatcher Spots are small round randomly placed white spots on color. They can appear or disappear over time. It is thought they are a reaction to bug bites. They are not associated with appaloosa. Birdcatcher spots are named after a Thoroughbred of that name.
Horses that are considered to be a curly have curly hair on their bodies year round. The curly coat is usually more pronounced in winter. Curlies often have a kinky mane and tail. Some consider curlies to be hypoallergenic as many with horse allergies do not have an allergic reaction with curly horses. Current research theorizes that there are separate dominant and recessive inheritance of curly coats. The dominant type of curly is what generally makes up the Bashkir Curly Horse and American Curly Horse breeds. The recessive type of curly is what has been found in the Chincoteague Pony and also appears in a great variety of breeds. A recessive curly will inherit it from both parents. The parents of a curly can have normal straight hair as a carrier will not be affected. The curly coat can skip generations. There is not a genetic test for curly at this time.
Cryptic tobianos have little or no body spotting. They are also known as minial or slipped tobianos. Cryptic tobianos still have white on the legs. This supression of white has been found to be genetic, there is not a genetic test for it yet.
Cryptic tobiano appears to be in several Chincoteague families.
Dark spots around the hoof on a pony's white legs are called ermine spots. Ermine spots can occur on any leg that is white and are a form of occluding spots. Ermine spots cause a hoof to be striped.
Lacing, also known as giraffe markings, marbling, or catbacked, is a white lace looking pattern that develops on the top of the back. It generally starts along the spine and stretches outwards. There is no known genetic reason behind lacing, however it has been known to run in some families. Skin diseases can also cause lacing, but not exclusively.
Occluding spots are areas of color that have been added back to white markings or suppress areas of white markings. Ink Spots/Cat Tracks and Ermine Spots are types of occluding spots.
Somatic mutations or mismarks are non genetic markings that cannot be passed on to offspring. Somatic mutations are due to conditions in the womb and cannot be deliberately created.
Skin Disease Marks
White marks can also appear from skin diseases due to fungus or allergies. They are not genetic and not inheritable.