For thousands of years dogs have been bred. From time to time humans have done inbreeding even from their own ancestral lines and also by mixing them from various lines. Over the centuries the whole breeding process is continuing until the present day, resulting in a huge genetically diversity of all types of dogs, breeds and hybrids, no other mammal can present. Furthermore no speciation developed, despite the appearance of a wide variation of dogs no other animal could obtain. Just compare the extreme difference between a Chihuahua and a Great Dane.
In the Smooth Coats, the coat should be of soft texture, close and glossy. (Heavier coats with undercoats permissible.) Coat placed well over body with ruff on neck preferred, and more scanty on head and ears. Hair on tail preferred furry. In Long Coats, the coat should be of a soft texture, either flat or slightly wavy, with undercoat preferred. Ears – Fringed. Tail – Full and long (as a plume). Feathering on feet and legs, pants on hind legs and large ruff on the neck desired and preferred. (The Chihuahua should be groomed only to create a neat appearance.) Disqualification – In Long Coats, too thin coat that resembles bareness.
The Chihuahua is a good companion dog. Courageous, extremely lively, proud and adventurous, they enjoy affection. Brave, cheerful and agile, Chihuahuas can be strong-willed without proper human leadership. They are loyal and become attached to their owners. Some like to lick their owner's faces. Socialize them well. For some, they may be slightly difficult to train, but they are intelligent, learn quickly, and respond well to proper, firm but gentle (positive reinforcement) training. May be difficult to housebreak. Do not let the Chihuahua get away with things you would not allow a large dog to do (Small Dog Syndrome), such as jumping up on humans. While it may be cute for a 5-pound tiny dog to put his paws on your leg when you come home from work, it is allowing a dominant behavior. If you allow this little dog to be your pack leader it will develop many behavior issues such as jealousy, aggression with other dogs and sometimes with humans, and will become undeniably suspicious of people except for its owner. When strangers are present, it will begin to follow its owner's every move, keeping as close as possible. A Chihuahua that is pack leader of its humans may snap at children. This breed is generally not recommended for children, not because it is not good with them, but because most people treat the Chihuahua differently than they would a large dog, causing it to become untrustworthy. Because of its size, this breed tends to be babied and things we humans clearly see as bad behavior for a large dog are looked over as cute with a small dog. Small dogs also tend to be walked less, as humans assume they get enough exercise just running around during the day. However, a walk provides more than just exercise. It provides mental stimulation and satisfies the migration instinct all dogs have. Because of this, small breeds such as the Chihuahua tend to become snappish, yappy, protective and untrustworthy with kids and humans they do not know. Chihuahuas that are their human's pack leader tend to be fairly dog-aggressive. An owner who realizes this and treats the Chihuahua no differently than they would a large breed, becoming a clear pack leader, will get a different, more appealing temperament out of this wonderful little dog, finding it to be a good little child companion.
Chihuahuas occur in virtually any color combination, from solid to marked or splashed,[19] allowing for colors from solid black to solid white, spotted, sabled, or a variety of other colors and patterns. Colors and patterns can combine and affect each other, resulting in a very high degree of variation. Common colors are fawn, red, cream, chocolate, brown, mixed, white, and black. No color or pattern is considered more valuable than another.
Chihuahua puppies can be at risk for hypoglycemia (low blood sugar). Signs of hypoglycemia include lethargy, sleepiness, uncoordinated walking, unfocused eyes, spasms of the neck muscles or head pulling back or to the side, fainting, and seizures. Hypoglycemia can be avoided with adequate nutrition and frequent feedings, especially for Chihuahuas that are younger, smaller, or leaner. Chihuahua owners should have a simple-sugar supplement on hand to use in emergencies, such as Nutri-Cal or corn syrup. These supplements can be rubbed on the gums and roof of the mouth to rapidly raise the blood sugar level.
When the Spanish first arrived in Chihuahua, more than 200 indigenous groups, including Native Americans, already inhabited the area. Although little of this period’s history is recorded, archeologists have found evidence of inhabitants dating as far back as 3,000 years. Some of these tribes include the Tarahumara (Raramuri), Apache, Comanche and Guarojío. For several thousand years, indigenous groups living in Chihuahua maintained trading relations with groups in other areas. Perhaps the most notable inhabitants were the Tarahumara (Raramuri), a people whose rich spiritual ideology, passive resistance and strong cultural identity enabled them to persevere despite foreign intrusions. Other tribes, like the warlike Apache, were overwhelmed and eventually assimilated after the arrival of the Spaniards.
The Beagle should do well on a high-quality dog food, whether commercially manufactured or home-prepared with your veterinarian’s supervision and approval. Any diet should be appropriate to the dog’s age (puppy, adult, or senior). Some dogs are prone to getting overweight, so watch your dog’s calorie consumption and weight level. Treats can be an important aid in training, but giving too many can cause obesity. Learn about which human foods are safe for dogs, and which are not. Check with your vet if you have any concerns about your dog’s weight or diet. Clean, fresh water should be available at all times.
Chihuahuas are saucy and alert, with a mind of their own. They might not be able to talk, but that doesn’t prevent them from letting you know exactly what they want: usually plenty of quality time with their favorite person. Chihuahuas are often devoted to a particular person in the family and can even become obsessive about their desire to be with them and protect them. There’s a name for those dogs: “armpit piranhas.” If they’re being held and someone approaches the person holding them, the Chihuahua will make every effort to protect his person, whether it’s necessary or not.
Networking can help you find a dog that may be the perfect companion for your family. You can also search online for other Beagle rescues in your area.  Most people who love Beagles love all Beagles. That’s why breed clubs have rescue organizations devoted to taking care of homeless dogs. The National Beagle Club’s rescue network can help you find a dog that may be the perfect companion for your family. You can also search online for other Beagle rescues in your area.
Neck, Topline, Body: Neck – Slightly arched, gracefully sloping into lean shoulders. Topline– Level. Body -Ribs rounded and well sprung (but not too much “barrel-shaped”). Tail – Moderately long, carried sickle either up or out, or in a loop over the back with tip just touching the back. (Never tucked between legs.) Disqualifications – Docked tail, bobtail.
Chihuahuas can be easily frightened or provoked to attack, so are generally unsuitable for homes with small children.[25] The breed tends to be fiercely loyal to one particular person and in some cases may become overprotective of the person, especially around other people or animals,[25] and tend to have a "clannish" nature, often preferring the companionship of other Chihuahuas or Chihuahua mixes over other dogs.[26] These traits generally make them unsuitable for households with children who are not patient and calm.[19]
The Chihuahua's history is convoluted, and many theories surround the origin of the breed. Both folklore and archaeological finds show that the breed has origins in Mexico. The most common theory is that Chihuahua are descended from the Techichi, a companion dog favored by the Toltec civilization in Mexico.[2] No records of the Techichi are available before the 9th century, although dog pots from Colima, Mexico, buried as part of the western Mexico shaft tomb tradition, which date back to 300 BC, are thought to depict Techichis.[3] The earlier ancestors probably were present before the Mayas as dogs approximating the Chihuahua are found in materials from the Great Pyramid of Cholula, antedating 1530 and in the ruins of Chichen Itza on the Yucatán Peninsula.[2] However, a genetic study indicated that there was less than 2 percent pre-European mitochondrial DNA in modern Chihuahuas due to admixture with the European dogs.[4]
Beagles like to do what they want to do, not necessarily what you want them to do. They are true masters when it comes to selective hearing. If a Beagle isn’t interested in the request you’ve made — commands are futile with this breed — he will simply ignore you or wander off. That can be frustrating if you’re not prepared for it. Successfully living with a Beagle means making everything a game, one that will hold his attention.
By the fourteenth century, hare-hunting had become a popular sport in England, and the dogs used were probably of Beagle type. The origin of the name Beagle may be from old French words meaning open throat in reference to the breed’s melodious bay, or from the Celtic, old English, or old French words for small. The word Beagle was not used until 1475, however, but can then be found frequently in writings from the sixteenth century on.
Some of these tendencies can be helped through early training and socialization. Unfortunately, too many people with Chihuahuas allow them to become little tyrants, displaying manners that would not be acceptable in a larger dog. This dog needs gentle and consistent training from puppyhood on to control his nipping as well as any tendency he has to fight with other dogs. Like many small dogs, Chihuahuas aren't aware of their own size and won't hesitate to challenge a dog many times larger than themselves. Also, like many small dogs, Chihuahuas are difficult to house-train without a lot of consistency and patience.
As humans became more sophisticated, so did their dogs. Eventually, there emerged specific breeds of dogs, custom-bred to suit the breeders’ local needs and circumstances. The Greyhound, for instance, was the foundation type for the immense Irish Wolfhound and the dainty Italian Greyhound. All three have a distinct family resemblance, but you’d never mistake one for another.
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