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.

Leaping from your arms. Some Chihuahuas melt into your arms and stay there, but many are wriggly. They can be deceptive about it, too, apparently settling into your arms with contentment, then suddenly launching themselves through the air if you relax your grip. A fall from a few feet up, especially over a hard surface, can result in a broken leg or concussion. Hold on tight if you pick up a Chihuahua over concrete.
Reality: Remember: each dog is an individual and should be judged by his current personality and behavior. Certainly he may be influenced by his genetics and history, but after working with thousands of Pit Bulls, I can assert unequivocally that many (if not most) Pit Bulls of unknown parentage that have been horribly abused, neglected, and/or forced to fight still love people more than anything, and still will be loving family pets. Responsible rescues and shelters evaluate dog behavior prior to adoption, and then adopt out only those Pit Bulls that display the proper temperament toward humans.
Despite the many endearing qualities of the Chihuahua, if you’re thinking his tiny size makes him a great choice for children, you’d better think again. The Chihuahua may be just right for traveling around in a puppy purse, but he’s far too small and fragile for even the gentlest of children's games. Chihuahuas also tend to be high-strung and prone to nipping, snapping and even biting when frightened or threatened, or when defending his people or territory.
Whether you’re planning to get your new best friend from a breeder, a pet store, or another source, don’t forget that old adage “let the buyer beware”. Disreputable breeders and facilities that deal with puppy mills can be hard to distinguish from reliable operations. There’s no 100% guaranteed way to make sure you’ll never purchase a sick puppy, but researching the breed (so you know what to expect), checking out the facility (to identify unhealthy conditions or sick animals), and asking the right questions can reduce the chances of heading into a disastrous situation. And don’t forget to ask your veterinarian, who can often refer you to a reputable breeder, breed rescue organization, or other reliable source for healthy puppies. 

On the other hand, Cairn Terrier, Yorkshire Terrier, and Welsh Terrier are small-sized dogs that are very warm and cute. But at the same time, they are intelligent, bright, tenacious, and fearless, irrespective of their size and shape. They can be friendly with people, if they are socialized properly. It is highly important that these dogs go through proper obedience training. 
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. 
Reality: Remember: each dog is an individual and should be judged by his current personality and behavior. Certainly he may be influenced by his genetics and history, but after working with thousands of Pit Bulls, I can assert unequivocally that many (if not most) Pit Bulls of unknown parentage that have been horribly abused, neglected, and/or forced to fight still love people more than anything, and still will be loving family pets. Responsible rescues and shelters evaluate dog behavior prior to adoption, and then adopt out only those Pit Bulls that display the proper temperament toward humans.
Owners of rental properties may also be held liable if they knew an aggressive dog was living on their property and they did nothing to ensure the safety of other tenants at the property; as a result, many rental properties forbid pit bull-type dogs and any other breeds if the rental property's insurance will not cover damage inflicted by that type of dog. The dog breeds most often targeted by insurance companies include pit bull-type dogs, Rottweilers, German Shepherd Dogs, Doberman Pinschers, Akitas (Akita Inu and American Akitas), and Chow Chows.[68]
Likenesses of Chihuahua-like dogs decorate the artifacts of lost civilizations around the world. Trading among ancient cultures was more widespread than commonly assumed, so it is no surprise that similar dog types took root in far-flung places. How the Chihuahua type first came to the peoples of Mexico, however, is a secret of prehistory. We do know that when the Toltecs held sway in Mexico about a thousand years ago, their breed of choice was the Techichi, a larger, heavier ancestor of today’s Chi.
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.
I have dog that has dachshund and is mixed with another breed, unsure what breed though. He’s somewhere around 20inches tall at shoulder. And weighs around 30-40 pounds. He’s tan mostly with whitish tan on his muzzle. He’s a short hair. Kind of a pinhead with a big sausage body. Any idea what mix? He’s also very sweet and cuddly. He is fairly noisy. He’s not the most sociable with other dogs or people but can learn.
Hunters could follow these dogs on foot and could even carry one in a pocket if the need arose. By the 1800s, Beagles existed in several sizes, but the smaller “pocket-size” dogs were particularly popular. These dogs measured only about 9 inches and often needed the hunter’s assistance in crossing rough fields. One of the special appeals of the smaller Beagles was that the hunt could be followed even by “ladies, the aged, or the infirm,” as they slowly followed the winding path of the hare.
Pit bulls were created by crossbreeding bulldogs and terriers to produce a dog that combined the strength of the bulldog with the gameness and agility of the terrier.[6] In the United Kingdom, these dogs were used in blood sports such as bull-baiting and bear-baiting. These blood sports were officially eliminated in 1835, as Britain began to introduce animal welfare laws. Since dogfights were cheaper to organize and far easier to conceal from the law than bull- or bear-baits, blood sport proponents turned to pitting their dogs against each other instead.[5] Dog fighting was used as both a blood sport (often involving gambling) and a way to continue to test the quality of their stock. For decades afterwards, dog fighting took place clandestinely in small areas of Britain and America. In the early 20th century, pit bulls were used as catch dogs in America for semi-wild cattle and hogs, to hunt and drive livestock, and as family companions.[6] Some have been selectively bred for their fighting prowess.[8][9]
Luxating patellas are an orthopedic problem. The patella, or kneecap, of most very small dogs, including the Chihuahua, can very easily become displaced, causing pain and lameness. In mild cases the knee quickly slips back into place on its own, but severe cases must be corrected surgically. Ask your veterinarian to examine your dog's knees regularly, especially if you notice him limping or "bunny hopping" while running.
In rare cases, beagles may develop immune mediated polygenic arthritis (where the immune system attacks the joints) even at a young age. The symptoms can sometimes be relieved by steroid treatments.[49] Another rare disease in the breed is neonatal cerebellar cortical degeneration. Affected puppies are slow, have lower co-ordination, fall more often and don't have a normal gait. It has an estimated carrier rate of 5% and affected rate of 0.1%. A genetic test is available.[53][54]
All dogs have the potential to develop genetic health problems, just as all people have the potential to inherit a particular disease. Run, don’t walk, from any breeder who does not offer a health guarantee on puppies, who tells you that the breed is 100 percent healthy and has no known problems, or who tells you that her puppies are isolated from the main part of the household for health reasons. A reputable breeder will be honest and open about health problems in the breed and the incidence with which they occur in her lines. Here’s a brief rundown on what you should know.
Beagles are generally healthy, but certain health problems can affect them if breeders aren’t careful about performing health checks. They include hip dysplasia, a genetic malformation of the hip socket and certain types of heart conditions. Despite good breeding, Beagles may experience tears of the anterior cruciate ligament, which can require surgical repair, and intervertebral disc disease, a spinal problem that can make movement painful and may require surgical repair.
Owners of rental properties may also be held liable if they knew an aggressive dog was living on their property and they did nothing to ensure the safety of other tenants at the property; as a result, many rental properties forbid pit bull-type dogs and any other breeds if the rental property's insurance will not cover damage inflicted by that type of dog. The dog breeds most often targeted by insurance companies include pit bull-type dogs, Rottweilers, German Shepherd Dogs, Doberman Pinschers, Akitas (Akita Inu and American Akitas), and Chow Chows.[68]
Chihuahuas possess loyalty, charm, and big-dog attitude. Even tiny dogs require training, and without it this clever scamp will rule your household like a little Napoleon. Compact and confident, Chihuahuas are ideal city pets. They are too small for roughhousing with kids, and special care must be taken in cold weather, but Chihuahuas are adaptable—as long as they get lots of quality time in their preferred lap.
It is not known why the black and tan Kerry Beagle, present in Ireland since Celtic times, has the beagle description, since at 22 to 24 inches (56 to 61 cm) it is significantly taller than the modern day beagle, and in earlier times was even larger. Some writers suggest that the beagle's scenting ability may have come from cross-breeding earlier strains with the Kerry Beagle. Originally used for hunting stags, it is today used for hare and drag hunting.[28]

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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