If the Tobiano and Overo types of markings were not sufficiently mystifying to the Paint Horse novice, there is yet another pattern type to be digested. This, the Tovero, is brought about by the presence of both Tobiano and Overo genes in a single horse. Since all of these genes as identified are deemed dominant, such a horse will display markings characteristic of both pattern types. These can be displayed minimally or maximally, and at all degrees of "loudness" in between.

The composite of marking types that can be embodied in a Tovero makes it difficult to pinpoint features that make them distinct vs a loudly marked Tobiano or Overo with a high percentage of white.

• Head: This often has a fair amount of white. "Medicine hat" features are not uncommon, as are "moustache" markings, representing a patch of dark skin on the upper lip.

• Top line: Very often, the horse has a high percentage of white on its body, often crossing the top line. More balanced pattern schemes do exist.

• Mane and tail: Depending on the extent of the white on the body, the tail can be fully coloured or streaked. Some horses may have an all-white tail.

• Hooves and lower legs: Hooves are generally white or striped. Legs are often white.

• Eyes: At least one eye is generally blue (wall).

• Body patterns: These can be regular or irregular, with or without roaning or shadowing, depending on the type Overo genes present.

Toveros are well known for throwing a high percentage of coloured foals – at least 75% – when bred to solid horses, given that they carry the Tobiano gene and at least one type of Overo gene. In some Tovero stallions, the colour to solid ratio is said to approach 90%! As with Sabinos and combination Overos, Toveros with a high percentage of white on their bodies are said to produce a higher percentage of patterned offspring.

NB: The genes that cause markings in Paint Horses can also coexist with those for Appaloosa spotting – but we won't be discussing the "Pintaloosa" here!