The Aztecs conquered the Toltecs in the 12th century. Historians credit the Aztecs with refining the Techichi into a smaller, lighter dog. By the time Spanish conquistadors toppled Aztec civilization in the 1500s, the Techichi was so integral to Aztec culture it was considered one of Montezuma’s fabled treasures, once presumed lost forever after the conquest of Cortez.
Glaucoma: This is a painful disease in which pressure in the eye becomes abnormally high. Eyes are constantly producing and draining a fluid called aqueous humor — if the fluid doesn't drain correctly, the pressure inside the eye increases causing damage to the optic nerve and resulting in vision loss and blindness. There are two types. Primary glaucoma, which is hereditary, and secondary glaucoma which is a result of inflammation, a tumor, or injury. Glaucoma generally affects one eye first, which will be red, teary, squinty, and appear painful. A dilated pupil won't react to light, and the front of the eye will have a whitish, almost blue cloudiness. Vision loss and eventually blindness will result, sometimes even with treatment (surgery or medication, depending on the case).
The longcoated Chihuahua is the product of a recessive gene, meaning a puppy must have the gene from both parents for the long coat to express itself, so he isn’t seen in litters as frequently as the smooth. The long, soft coat is flat or slightly curly, and the dog has a ruff around the neck, fringed ears, feathering on the legs and a plumed tail. The hair on the rest of the body is almost as smooth as that on the smooth Chihuahua. Longcoated Chihuahuas are beautiful, and they’re easy to groom, but they do shed seasonally.
The Beagle originated in England. His heritage stretches back to the packs of hunting hounds kept by landed gentry to hunt deer and hare. Beagle-like scenthounds were known as far back as 1475, when the word “Beagle” was first used to describe this type of hunting dog. It’s a matter of debate whether the name comes from a Celtic word meaning “small” or a French word meaning “open mouth” or “loud mouth.” Given the Beagle’s propensity for baying when he catches an interesting scent on the wind, the latter theory seems most likely.
The merle coat pattern, which appears mottled, is not traditionally considered part of the breed standard. In May 2007, The Kennel Club decided not to register puppies with this coloration due to the health risks associated with the responsible gene, and in December of that year, formally amended its breed standard to disqualify merle dogs.[20] The Fédération Cynologique Internationale, which represents the major kennel clubs of 84 countries, also disqualified merle.[16] Other countries' kennel clubs, including Canada, Australia, New Zealand, and Germany, have also disqualified merle. However, in May 2008, the Chihuahua Club of America voted that merles would not be disqualified in the United States, and would be fully registrable and able to compete in AKC events. Opponents of merle recognition suspect the coloration came about by modern crossbreeding with other dogs and not by natural genetic drift.[21][citation needed]
Allergies: Allergies are quite common in APBT/AmStaffs. Skin allergies are typically caused by such environmental allergens as fleas, grass, pollen, and dust.They can also be food related, but this is less common. Common food allergens include beef, rice, wheat, and corn. Allergies can cause intense itching and discomfort, which means dogs will dig and chew sometimes till they bleed. This is risky because secondary infections can develop in the damaged tissue. To treat allergies, the cause must be identified and removed from the dog's environment if possible. A veterinarian can help you with this, as well as let you know which allergy symptoms can be controlled with medication.
A well rounded “apple dome” skull, with or without molera. Expression – Saucy. Eyes – Full, round, but not protruding, balanced, set well apart-luminous dark or luminous ruby. Light eyes in blond or white-colored dogs permissible. Blue eyes or a difference in the color of the iris in the two eyes, or two different colors within one iris should be considered a serious fault. Ears – Large, erect type ears, held more upright when alert, but flaring to the sides at a 45 degree angle when in repose, giving breadth between the ears. Stop – Well defined. When viewed in profile, it forms a near 90 degree angle where muzzle joins skull.

A fenced backyard is a necessity with a scenthound such as a Beagle. When outside, your Beagle should be on lead in unconfined areas, or securely confined and supervised. He's a wanderer by nature, so in case he escapes — a common occurrence with Beagles — be sure he's microchipped and wearing identification tags on his collar so he can be returned to you.

Another myth about Pit Bull type dogs is that they have a locked jaw which is impossible to break. While many of these dogs do indeed have a strong bite, it is a myth that their jaw locks. It can be broken using a bite stick or by some of the other ways mentioned in our article on breaking a Pit Bull's bite. Another important factor in Pit Bulls is the tendency to dock their tails and ears which makes it more difficult to recognize the signs of aggression in these dogs.
The ancestors to the Chihuahua nearly became extinct during the 1500s, when the Aztec Empire was decimated by Hernán Cortés and the Spanish colonizers. In 1850, three small dogs -- now thought to be modern versions of the Chihuahua -- were discovered in the Mexican state of Chihuahua, from which breed gets its name. Border states within the United States, such as Texas, Arizona and New Mexico, soon began to see a massive import of the dog breed. However, it wasn't until the Rhumba King, Xavier Cugat, began appearing in films carrying a Chihuahua dog in the early 1900s, that the breed gained its celebrity. Today, it has emerged as one of the most popular breeds in the United States.
Prone to rheumatism, slipped stifle, colds and gum problems. Also corneal dryness and secondary glaucoma, due to their protruding eyes. Gains weight easily. Take caution around toxic products such as chocolate or fertilizer. This is a very small breed and it will not take much to poison them. Chihuahuas are often born via cesarean section because puppies are born with relatively large heads. Susceptible to fractures and other accidents in puppyhood. Some Chihuahuas have a molera, an unclosed section of the skull which can remain open throughout life. This makes the dog prone to injury. Has a tendency to wheeze and snore because of their small, short muzzles. Prone to stress, caused by the owners tendency to treat them like little babies. All dogs, even tiny ones, need to feel their owners are strong-minded beings able to handle the entire pack.
Pet Chihuahuas (that is, those bred or purchased as companions rather than show dogs) often range above these weights, even above 10 lb if they have large bone structures or are allowed to become overweight.[11] This does not mean that they are not purebred Chihuahuas; they just do not meet the requirements to enter a conformation show. Oversized Chihuahuas are seen in some of the best, and worst, bloodlines. Chihuahuas do not breed true for size, and puppies from the same litter can mature in drastically different sizes from one another. Also, larger breeding females are less likely to experience dystocia (obstructed labour). Many breeders try to breed Chihuahuas as small as possible, because those marketed as "teacup" or "tiny teacup" command higher prices.[17] Typically, the breed standard for both the Long and Short Coat Chihuahuas will be identical except for the description of the coat.[18] Chihuahuas have large, round eyes and large, erect ears, set in a high, dramatically rounded skull.[11]
Tiny dogs often come with big health problems, and the Chihuahua is no exception. Many Chihuahuas live long, healthy lives, but conditions seen in the breed include breathing difficulties caused by a windpipe that collapses in on itself; luxating patellas; eye disorders; congestive heart disease; certain neurological conditions including hydrocephalus (fluid buildup in and around the brain), neuronal ceroid lipofuscinosis, a condition in which fatty pigments in the brain cause the progressive loss of brain function, and atlantoaxial subluxation, a neck deformity that may require surgical correction; obesity; and dental problems caused by the small size of their mouths. 
Wellness CORE Grain-Free Small Breed Turkey & Chicken Recipe Dry Dog Food: This protein-heavy, dry dog food lists turkey meal, deboned turkey, chicken meal, peas and potatoes as its main ingredients. It also has some carbohydrates but only in small amounts and derived from vegetables. Aside from the needed vitamins and minerals, it also has chondroitin and glucosamine to help improve your dog’s bones.
Reality: This is a stereotype that is biased toward generalizing and condemning an entire breed based on the actions of a few bad people. The truth is that each dog should be evaluated by his own merits and not by his breed. A corollary truth is that there truly are no bad dogs, only bad people. In his essay Troublemakers, Malcolm Gladwell discusses what Pit Bull stereotypes can teach us about the wrongness of racial profiling of both humans and dogs.

The merle coat pattern, which appears mottled, is not traditionally considered part of the breed standard. In May 2007, The Kennel Club decided not to register puppies with this coloration due to the health risks associated with the responsible gene, and in December of that year, formally amended its breed standard to disqualify merle dogs.[20] The Fédération Cynologique Internationale, which represents the major kennel clubs of 84 countries, also disqualified merle.[16] Other countries' kennel clubs, including Canada, Australia, New Zealand, and Germany, have also disqualified merle. However, in May 2008, the Chihuahua Club of America voted that merles would not be disqualified in the United States, and would be fully registrable and able to compete in AKC events. Opponents of merle recognition suspect the coloration came about by modern crossbreeding with other dogs and not by natural genetic drift.[21][citation needed]
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