No Foot, No Dog | Form Follows Function: The old adage, “No Hoof, No Horse,” common in North America in the 18th century, speaks to how important the feet are to an animal. A lame horse is useless to its owner. The same principle can be applied to the dog as “No Foot, No Dog.”
The first time I heard the phrase used to describe a dog was when I was judging an ARBA show in the late 1990s. A fellow judge (a hound man), whom I greatly admired, chastised me for using a hound with bad feet in the Group. This led to a great discussion and the beginning of a long friendship.
The feet are the foundation on which the dog is “built.” Just as the foundation for a building must be solid, so must the feet of the dog be correct for its breed.
The anatomy of the canine foot is composed of the toenails (claws), toes, toe (digital) pads, the metacarpal pads, the dewclaw, and the carpal pad. (See Figure 1.) The canine foot has four toes, which are functional and contain three bones to form each toe. A fifth toe, called the “dewclaw” when it is not removed, differs from the other four in that it only contains two bones. The feet serve as a base of support for the dog. They serve as a cushion to absorb shock, and they provide traction to start motion and as a brake to stop.
We will start with the toenails or claws, which are at the end of each toe. (See Figure 2.) Composed of keratin, the nails enable the dog to grip the ground and also to scratch (both the ground and themselves) and help maintain a grip on something they are chewing. The average dog has four functional toes (digits) and may be born with a fifth toe called the dewclaw, located on the inner side of the pastern on the front leg. The dewclaw is considered to have lost most or all of its original function. Dewclaws may also be found on the rear legs. Several breeds require dewclaws on some or all of the legs. On the average dog, however, they are usually removed, especially if they have no contact with the ground.
Each of the toes is supported by a pad composed of thick layers of fat and connective tissue covered with several layers of skin, forming a thick, horny skin. This thick skin makes it possible for the dog to comfortably work over many types of terrain, from abrasive to slick and slippery. It also varies greatly in fluctuating temperatures. The pads serve as a weight bearing, shock absorbing cushion, and aid in traction. (See Figures 1 & 2.)
In the front feet, next comes the metacarpal bones, commonly referred to as the pastern. These bones serve to join the pastern joint (carpus joint) with the toes (digits) of the dog. There are four metacarpal bones (five if the dewclaw is not removed), each leading to one of the toes. Of the four, the outer bones (leading to the two outside toes) are shorter than the two inner bones (leading to the two center toes). These metacarpal bones relate to the palm of the human hand—between the wrist and the fingers. The dog actually walks only on the toes/digits of its foot. (See Figure 2.) The carpal pads are found on the front feet, farther up the foot near the wrist or pastern joint. (See Figures 1 & 2.) They are of the same structure as the pads under the toes. The carpal pad comes into play on steep or slippery surfaces by helping the dog to retain its balance, It is also sometimes referred to as the “stopper pad,” working as a brake. This pad also serves to support the crouching/crawling dog (think Border Collie approaching livestock) as it moves over rough terrain.
The metacarpal pads on the front feet (metatarsal on rear) are the largest pads on the foot and are located behind the pads of the toes. As with the toe pads, the metacarpal/metatarsal pads provide shock absorption and traction. The metatarsus of the rear is similar to the metacarpus of the front, except that it is longer. (See Figure 1.)
As we move from the toes, up toward the foreleg, the carpal bones form the pastern joint (wrist). The pastern joint is a compound joint formed by the articulation of the seven carpal bones (stacked in two rows), with the radius and ulna bones of the foreleg on the upper side of the pastern, and the metacarpal bones on the lower side. These seven bones form a compound joint that allows for a great deal of mobility and has a significant shock-absorbing capacity. This joint allows for the slope of the pastern and provides cushioning for the striking foot. The short bones of the carpus serve to diffuse concussion in the limbs as the bones experience pounding force when a dog runs or lands from a jump. (See Figure 2.) The tarsus, or hock joint on the rear legs, is similar to the pastern on the forelegs as it consists of seven bones arranged in two rows (three on top to articulate with the fibula and tibia bones, and four distal that articulate with the metatarsals of the rear foot).
Foot conformation is directly related to the task the breed was developed to accomplish. A Cat Foot is compact, small, and round in shape. It is built for stability, endurance, and bearing great weight. The compact foot is easily picked up during forward movement, allowing a dog to conserve energy. The cat foot works well for dogs that have to move over uneven ground. Not surprisingly, it is found on most large Working breeds like the Doberman Pinscher and the Newfoundland. (See Figure 3.)
The Hare Foot has two elongated middle toes, and is formed for speed and quick changes of direction as well as for fast movement from a standstill. Dog breeds with hare feet include the Whippet and the Greyhound. The longer hare foot allows the foot to get a better grip on the ground when running straight ahead. (See figure 4.)
Dogs with oval feet have slightly longer middle toes (shorter than the hare foot and longer than the cat foot) and are for the dog that must be able to endure, but also needs the added speed and jumping ability associated with the hare foot. The oval foot is found in breeds as diverse as the Pembroke Welsh Corgi, Basenji, Pointer, Chinook, and Toy Fox Terrier. (See Figure 5.)
Dogs with webbed feet increase the surface area of the foot while also providing better movement through water, mud or snow. In breeds such as the Chesapeake Bay Retriever and the Otterhound, as well as the Portuguese Water Dog and the Newfoundland, the webbed foot also serves somewhat as a paddle when swimming. A few breeds even call for “snowshoe” feet, to help the dog traverse more easily on snow and ice. The Alaskan Malamute and the Tibetan Terrier ask for snowshoe feet.
Two types of feet that are considered faulty are the flat foot and the splayed foot. The flat foot is usually accompanied by a dog that is “down in pastern” and is basically due to a laxity of the tendons of the foot and carpal joint. (See Figure 6.) A splayed foot is weak and the toes are spread apart, especially when in motion. (See Figure 7.)
Foot shape can be affected by heredity, lack of exercise during critical periods of development, and improper ground surface during periods of growth. As a breeder, one must always know not only the virtues of the dog we wish to breed, but most importantly, we must also know their faults. We must breed for the whole dog, trying to find a mate that excels where our dog may be faulty, in hope of correcting the faulty parts in the next generation. Again, we must look at the dog as a whole. We must know the traits that are essential to breed type and know where we can “give” a little without losing breed character.
The feet of any breed serve as the foundation upon which the entire dog is “built.” Just as a contractor would never try to construct a building upon a faulty foundation, neither should we ignore the correct foot for our breed. A faulty foundation will eventually fail, and if it does, the entire building is in danger of collapse. As breeders, we should pay very close attention to breeding for the correct foot for our breed, as this is the very foundation upon which our breeds stand.
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