Based on the diversity, it is possible to classify dogs into categories according to their weight and morphology. The breeds are divided into four sub-categories: small (-10 kg), medium (11-25 kg), large (26-45 kg) and giant (-45 kg) (Cavachon puppy). At the other end, the morphological classification has become a bit more complex, though only three subcategories.
The oldest remains of dogs found two skulls from Russia and a jawbone from Germany from about 13,000 to 17,000 years ago. Likely ancestor is the large varieties grown mainly wolves around the northern hemisphere. Remains of smaller dogs have been found the caves around the Middle East and are expected to be about 12,000 years old.
Chihuahua dogs are at the variety they will usually only about 15-23 inches at the withers and weigh about 1-6 kg. Pomeranian dogs are another small varieties but they have about 18-30 inches at the withers and weigh about 1-3 kg. In contrast, the Great Dane is over 90 inches at the withers and can weigh up to 80 kg. St. Bernharo dog can be up to 85-90 cm at the withers and weighed much more than the Great Dane or up to 135 kg.
The lengths are four, while there are five types: hairless, shallow, short and semi-long; hard, heterogeneous, smooth, silky. Canine skeleton is composed of 25 leading bony parts, is, as in animals of similar structure, essential for locomotion and protection, as well as having other primary functions. The first is the skeleton, the rigid structure that supports the body and performs the functions of protection, movement, reserves of chemical elements such as calcium, and the production of red blood cells in these animals. In dogs, they have the body along a total of 25 bone major divisions, two phenomena are observed during the relating to pre-puberty: increasing the thickness and the length and total bone calcification of conjugation.
Some varieties have dogs up to 270 degrees field of view (field of view for people is 180). Eyesight is about twice more sensitive than the sight of cats. Dogs see better in the dark than humans. K9s detect sound waves down to 16-20 Hz, which is considerably lower frequencies than humans (or 20-70 Hz). They can also hear sound waves above 45 kHz, which is considerably higher frequency than humans can hear (13-20 kHz).
Hybrids are dogs that do not belong to any particular breed. But hybrids are no less desirable than pure bred dogs as pets or companions or working dogs. Bulldogs are known for their short muzzle great skin on the face. Popularity of different dog varieties will vary by country and over time. Labrador retrieves for example, has enjoyed great popularity in North America and Europe.
Popularity also vary depending on their roles. Thus, Rottweiler and Doberman dogs, Bullmastiff and German dogs are popular and common varieties. Labrador and Golden breeds are also popular guide dogs, even those that were originally bred as hunting dogs, selective to retrieve prey. Variations are diverse in size, appearance, and behavior than any other domesticated animal.
Search dogs have been used to search for missing people, both in avalanches, ruins and elsewhere, as well as specific items such as drugs and explosives. When compared physically to his ancestor, the dog has minor differences in the genetic design. The bone structures, the types of muscle, nerve and dentition, for example, are identical.
The oldest remains of dogs found two skulls from Russia and a jawbone from Germany from about 13,000 to 17,000 years ago. Likely ancestor is the large varieties grown mainly wolves around the northern hemisphere. Remains of smaller dogs have been found the caves around the Middle East and are expected to be about 12,000 years old.
Chihuahua dogs are at the variety they will usually only about 15-23 inches at the withers and weigh about 1-6 kg. Pomeranian dogs are another small varieties but they have about 18-30 inches at the withers and weigh about 1-3 kg. In contrast, the Great Dane is over 90 inches at the withers and can weigh up to 80 kg. St. Bernharo dog can be up to 85-90 cm at the withers and weighed much more than the Great Dane or up to 135 kg.
The lengths are four, while there are five types: hairless, shallow, short and semi-long; hard, heterogeneous, smooth, silky. Canine skeleton is composed of 25 leading bony parts, is, as in animals of similar structure, essential for locomotion and protection, as well as having other primary functions. The first is the skeleton, the rigid structure that supports the body and performs the functions of protection, movement, reserves of chemical elements such as calcium, and the production of red blood cells in these animals. In dogs, they have the body along a total of 25 bone major divisions, two phenomena are observed during the relating to pre-puberty: increasing the thickness and the length and total bone calcification of conjugation.
Some varieties have dogs up to 270 degrees field of view (field of view for people is 180). Eyesight is about twice more sensitive than the sight of cats. Dogs see better in the dark than humans. K9s detect sound waves down to 16-20 Hz, which is considerably lower frequencies than humans (or 20-70 Hz). They can also hear sound waves above 45 kHz, which is considerably higher frequency than humans can hear (13-20 kHz).
Hybrids are dogs that do not belong to any particular breed. But hybrids are no less desirable than pure bred dogs as pets or companions or working dogs. Bulldogs are known for their short muzzle great skin on the face. Popularity of different dog varieties will vary by country and over time. Labrador retrieves for example, has enjoyed great popularity in North America and Europe.
Popularity also vary depending on their roles. Thus, Rottweiler and Doberman dogs, Bullmastiff and German dogs are popular and common varieties. Labrador and Golden breeds are also popular guide dogs, even those that were originally bred as hunting dogs, selective to retrieve prey. Variations are diverse in size, appearance, and behavior than any other domesticated animal.
Search dogs have been used to search for missing people, both in avalanches, ruins and elsewhere, as well as specific items such as drugs and explosives. When compared physically to his ancestor, the dog has minor differences in the genetic design. The bone structures, the types of muscle, nerve and dentition, for example, are identical.
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