Dog Discoveries

Dog Word of the Day: Dolicocephalic

 

What exactly does the word “dolicocephalic” mean? This word may sound a bit complicated, but once we break it into smaller components,  it becomes easier to understand. Chances are, you might even own a dolicocephalic dog breed too and you don’t even know it! This term though isn’t restricted to the dog world only, there are also many dolicocephalic cats and some dolicopehalic rabbits too out there! So let’s take a closer look into this word and discover some intriguing facts about the dog word of the day: “dolicocephalic.”

A Lesson in Etymology 

What does the word dolicocephalic mean? Let’s take a look at the history of this word. Merriam Webster tells us that the word derives from the Greek word “dolichos” which means long and “kephalos,” which means head.

If you put the two words together, you have “long head,” therefore, dolicocephalic in the dog world pertains to certain types of dogs where the length of the head is greater than its width.

This is the total opposite of dogs who are brachycephalic, meaning short-headed.

Dolicocephalic: long-headed Brachycephalic: short-headed

What Teeth You Have!greyhound dolicocephlic

Dogs with long heads may share some interesting traits that makes them quite different than other dogs.

If you look at their teeth, their longer jaws can make them appear as if they have gaps between one tooth and another. This is called “diastemata” which means  “a space or gap between two teeth.”

In some cases, the space may be so wide that to some people it may appear as if they are missing teeth, but they are not, explains Dr. Cedric Tutt, a Veterinary Specialist in Dentistry in South Africa in the book “Small Animal Dentistry: A Manual of Techniques.”

dolicocephalicWhat Eyes You Have!

Many dogs with dolicocephalic heads share some common traits: they may have a history of being selectively bred to have an exceptional  sighthound eye sight and are very fast.

Sight hound breeds like the saluki, borzoi, greyhound and Afghan hound, were selectively bred for catching fast prey, therefore it shouldn’t be surprising if their facial conformation allowed a wider field of vision so they could better spot prey.

Their almond-shaped eyes are set wide apart. It has been noted that distribution of retinal ganglion cells is correlated with nose length, something particularly important in sight hounds as they needed to be scanning the horizon for prey over vast open landscapes.

A Nose For Problemsmartingale collar greyhounds

According to the book “The Dog and Its Genome,” dolicocephalic dog breeds are prone to problems related to the shape of their heads such as nasal tumors and mycotic rhinitis.

Another potential problem dolicocephalic breeds may be predisposed to is aspergillosis, a respiratory infection that is typically localized to the dog’s nasal cavity and known for causing  lethargy, pain and ulcerations on the nostrils, sneezing,  nasal discharge and nose bleeds, according to the Merck Veterinary Manual.

Did you know? Because sight hounds have narrow heads, they can easily slip out of regular buckle collars.

Many trainers suggest using martingale collars (also known as greyhound collars) for dolicocephelic dogs. When fitted correctly, these collars work well as they’re less likely to slip over the dog’s head, explained the late internationally-acclaimed veterinarian, animal behaviorist, Dr Sophia Yin.

References:

  • Miller P. E.Murphy C. J, 1995 Vision in dogs. J. Am. Vet. Med. Assoc. 207: 16231634.
  • McGreevy P, Grassi T. D, Harman A. M, 2004A strong correlation exists between the distribution of retinal ganglion cells and nose length in the dog. Brain Behav. Evol. 63: 1322
  • The Genetics of Canine Skull Shape Variation, Jeffrey J. Schoenebeck, Elaine A. Ostrander , 

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