Because of the lack of cones in canines, they are thought to be color blind, despite having fewer cones than humans. Because the hunter is easily able to distinguish them as dogs, they always have a noticeable amount of white on their coat. Jack Russell Terriers can be white, black, or tan in color, or tricolor (white, black, or tan) with markings. There is a common color combination of black and white with Jack Russell Terriers, but the primary color will always be white. It’s possible that Jack Russells will have black markings such as full- face masks or straddle markings as a result of a color combination. Previously reported deafness prevalence in Jack Russell terriers has been revised downward. If you are considering adopting a jack russell, it is important to do your research to determine if the dog you are interested in is deaf or not. Deafness in jack russells can be caused by a number of different factors, including genetics, trauma, and disease. Some white jack russells may be deaf, but this is not always the case. There are a variety of different jack russells, and not all of them are deaf.
