The skull should be fairly long, slightly domed at occiput, with cranium broad and full. Ears-Ears set on moderately low, long, reaching when drawn out nearly, if not quite, to the end of the nose; fine in texture, fairly broad-with almost entire absence of erectile power-setting close to the head, with the forward edge slightly inturning to the cheek-rounded at tip. Eyes-Eyes large, set well apart-soft and houndlike-expression gentle and pleading; of a brown or hazel color. Muzzle-Muzzle of medium length-straight and square-cut-the stop moderately defined. Jaws-Level. Lips free from flews; nostrils large and open. Defects-A very flat skull, narrow across the top; excess of dome, eyes small, sharp and terrierlike, or prominent and protruding; muzzle long, snipy or cut away decidedly below the eyes, or very short. Roman-nosed, or upturned, giving a dish-face expression. Ears short, set on high or with a tendency to rise above the point of origin.
Intervertebral Disk Disease: The spinal cord is surrounded by the vertebral column, and between the bones of the vertebral column are intervertebral discs that work as shock absorbers and allow normal movement of the vertebrae. The discs are made of two layers, an outer fibrous layer and an inner jelly-like layer. Intervertebral disc disease occurs when the jelly like inner layer protrudes into the spinal canal and pushes against the spinal cord. Compression of the spinal cord may be minimal, causing neck or back pain, or it can be severe, causing loss of sensation, paralysis, and lack of bowel or bladder control. The damage done by the spinal compression may be irreversible. Treatment is based on several factors, including location, severity, and length of time between injury and treatment. Confining the dog may be of some use, but surgery is often needed to relieve pressure on the spinal cord. Surgery is not always successful.
Seizure disorders, hypothyroidism, diabetes, cataracts and allergies may also be seen in the breed. Less common breed-related conditions include deafness, heart disease and dwarfism. Avoid breeders who try to sell you a puppy with dwarfism by marketing him as a “rare pocket Beagle.” Dwarf Beagles often have physical deformities such as a shortened neck, crooked legs or a broader skull and are often more prone to chronic arthritis.
Sites like Petfinder.com and Adopt-a-Pet.com can have you searching for a Beagle in your area in no time flat. The site allows you to be very specific in your requests (housetraining status, for example) or very general (all the Beagles available on Petfinder across the country). AnimalShelter can help you find animal rescue groups in your area. Also some local newspapers have “pets looking for homes” sections you can review.
If you live in a cold or rainy climate, housebreaking will be especially difficult, because Chihuahuas hate both the cold and the rain. In these climates, a COVERED potty area is strongly recommended. Sometimes a doggy door is necessary so your Chihuahua can run outside the moment he feels the urge in his tiny bladder. An indoor litterbox is another option.
Because Chihuahuas get cold easily they tend to love their dens and will often burrow themselves in pillows, clothes hampers, and blankets. They are often found under the covers or at the bottom of the bed, deep in the dark and safety of what they perceive as their den. Chihuahuas also enjoy time in sunlight. Chihuahuas sometimes act like cats and climb up to the highest point on a couch, usually on top of the pillows, and curl up into a ball. Chihuahuas have their own type of personality. They tend to be alert. Chihuahuas typically do not show fear; even though they are a smaller breed, they do not view their size as a disadvantage. 
It is important to note that some of these dogs are rare pit bull breeds. Some are region specific, such as the Pynat and Stuffawler Pit Bulls. These dogs may not even exist in many areas due to a lack of breeding or the relative infancy of the breed. Others may have different names in different territories. For example, the Chamuco is commonly known as the Mexican Pit Bull outside of Mexico. Some, such as the Razors Edge Pit Bull, have been excluded due to lack of suitable breed traits.
Reality: Pit Bulls do not have any special physical mechanism or enzyme that allows them to “lock” their jaws. If you compare a Pit Bull skull to a skull of any other dog breed, you can see with the naked eye that both skulls share the same characteristics and general bone structure. However, one personality trait of the Pit Bull breed is determination. Whatever Pit Bulls do, they do it with a great deal of enthusiasm, and it is this trait that can make it seem like they have a locking jaw when they bite down on something and are determined not to release it.
Chihuahuas can usually live with other dogs and cats without problem. They get along particularly well with other Chihuahuas. It is important to socialize the Chihuahua as a puppy to prevent overt aggressiveness. Small children may regard the Chihuahua as a toy, and their teasing can cause it to snap or bite. It is preferable not to leave the Chihuahua with children under the age of 12, unless they are well taught or supervised.
Contemporary significant pit bulls are: Weela, who helped save 32 people, 29 dogs, three horses, and one cat during Southern California's widespread flooding in 1993; Popsicle was a drug detection dog for U.S. Customs and worked on the Texas—Mexico border where in 1998 he made the then biggest cocaine drug find ever made at the Hidalgo Texas Port of Entry; Norton, who was placed in the Purina Animal Hall of Fame after he rescued his owner from a severe reaction to a spider bite; Titan, who rescued his owner's wife, who would have died from an aneurysm; D-Boy, who took three bullets to save his family from an intruder with a gun; Star, who, while protecting her owner, was shot by police in a video that went viral; and Lilly, who lost a leg after being struck by a freight train while pulling her unconscious owner from the train tracks. Daddy, Cesar Millan's right-hand dog, was famous for his mellow temperament and his ability to interact calmly with ill-mannered dogs.
Air France Safety Category 1 dogs, as defined by the French Ministry of Agriculture, Food and Forestry, are not permitted for transport in the cabin, or as baggage or cargo. These so-called "attack dogs" do not belong to a particular breed, but are similar in morphology to the following: Staffordshire Bull Terriers or American Staffordshire Terriers (pit bulls), Mastiffs and Tosas.
The history of the Chihuahua is quite controversial. According to one theory, it was originally developed in China and then brought to the Americas by Spanish traders, where it was interbred with small native dogs. Others speculate it is of South and Central American origin, descended from a small, mute dog -- the native Techichi -- which was occasionally sacrificed in Toltec religious rites. It was believed that this diminutive red dog guided the soul to the underworld after death. Thus, all Aztec families kept this dog and buried it with the deceased member of the family. (Curiously, the Toltecs and the Aztecs also fed on the Techichi.) When not used in burial rituals, however, the Aztec and Toltec priests and families took great care of the Techichis.
The most important thing to know about the Beagle is that he is a scenthound. His nose is the most important part of his anatomy and his head is always down to the ground, searching for an interesting trail to follow. Beagles have approximately 220 million scent receptors compared to the paltry 5 million or so in people, which makes them very good at picking up scents. Humorist Dave Barry once described his in-laws' Beagle as "a nose with feet."
When these "bull dogs" accompanied immigrants to America they began new careers as all-around farm dogs. Their jobs included hunting wild game, guarding the property from animal intruders, and providing companionship. In keeping with the "bigger is better" mindset of their new country, the settlers developed a dog larger than it had been in England.
Just like Apple Head and Deer Head Chihuahuas, Teacup Chihuahuas are from the same breed but have a different appearance. A Teacup Chihuahua on average doesn’t weigh more than four pounds. In a household they may need a little more looking after due to their small size. Teacup Chihuahuas can have either short or long hair. Although a Teacup is much smaller in size, they still have the same confident and energetic personality as a full sized Chihuahua. It is also very risky for Teacup Chihuahuas to have puppies due to their size. It can cause many complications and put their life at risk.  Compared to the typical lifespan of a Chihuahua a Teacup's lifespan tends to be much shorter due to the health issues they are more prone to have because of their small size.
English and American varieties are sometimes mentioned. However, there is no official recognition from any Kennel Club for this distinction. Beagles fitting the American Kennel Club standard – which disallows animals over 15 inches (38 cm) – are smaller on average than those fitting the Kennel Club standard which allows heights up to 16 inches (41 cm).
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.
Apple Head and Deer Head comes from the same breed of Chihuahuas but they are different due to their physical appearance. The Apple Head Chihuahua is known for having a round/ apple shaped head and “buggy eyes” whereas a Deer Head Chihuahua has a flatter head, thinner skull, wider eyes, and longer nose. Their physical body shape is mostly the same, except the Deer Head Chihuahua is known to have longer legs than other Chihuahuas. The Deer Head Chihuahua tends to be larger in weight, where an Apple Head is more likely to keep their weight under ten pounds. Apple Head Chihuahuas are bigger in length than they are tall and have shorter necks. Deer Head Chihuahuas have longer ears than Apple Heads and their head also has a slope like form. Both Apple Head and Deer Head can be a short hair or long hair. They also both come in various different colors such as brown, black, tan, or white. Chihuahuas can show traits from both Apple Head and Deer Head. Deer Head Chihuahuas tend to have better health than Apple Heads, due to their longer noses. Apple Heads have a higher risk of getting respiratory issues, due to having a smaller airway. Deer Headed Chihuahuas are not allowed in The American Kennel Club (a club of purebred dogs registered in the United States) due to not meeting the standards that Apple Heads do. Deer Head Chihuahuas are not allowed because they have a longer jaw line and a slope that connects their muzzle and head, creating a 45 degree angle instead of a 90 degree angle like the Apple Head. Apple Heads are allowed in AKC and meet the requirements due to having a smaller weight, having a rounder head, and also having a 90 degree angle formed by the muzzle to the forehead.
It is really common. They are Chi’s at heart sometimes and they are bred as lap/companion dogs so they are naturally very protective of their owners. Especially to Larger dogs and humans. What I have found with my baby girl is that she has what I call “big dog syndrome.’ As in she thinks she is much bigger than she is. She’ll get up in another dogs face in a heartbeat if it meant telling them to stay away from me. Once I pet that dog and talk to her when I do it she calms down and after 5-10 minutes she is best friends with them. Humans too. lol. It is just their way of being there for you too. Even if it is unwanted. Best thing is to roll with it and show them its alright and eventually they learn. they are so smart.
And, as far as dogs are concerned, I would love love to have a Bully friend :-) Currently I am mostly thinking between American Staffordshire Terrier, American Pit Bull or American Bulldog. American Bulldogs I know pretty well, Staffordshire some and with the Am. Pit Bulls I haven't had longer experiences. So, please, if you have some article or words of advice which could draw some more detailed comparison, please share. I have of course googled it all, but it all comes down to similar as I thought – they are similar in temperament, only American Bulldogs are better guards and generally a bit calmer/slower (more mastif, less terrier). All of them very gentle, loving, athletic. Is there something more or different you would say?
And before you decide to buy a puppy, consider whether an adult Chihuahua might better suit your needs and lifestyle. Puppies are loads of fun, but they require a lot of time and effort before they grow up to become the dog of your dreams. An adult Chihuahua may already have some training and will probably be less active, destructive and demanding than a puppy. With an adult, you know more about what you’re getting in terms of personality and health and you can find adults through breeders or shelters. If you are interested in acquiring an older dog through breeders, ask them about purchasing a retired show dog or if they know of an adult dog who needs a new home. If you want to adopt a dog, read the advice below on how to do that.
Because of their dog-fighting heritage, some American Pit Bull Terriers retain a tendency to be aggressive with other dogs, but if they are socialized early and trained to know what behavior is expected of them, that aggression can be minimized or overcome, and many are dog- and cat-friendly. Just to be safe, they should always be supervised in the presence of other pets.
I have a chiuhuahua border terrier cross. He’s just about 16 months old. It’s just me and my husband and he loves us equally. He hates kids, always barks and growls at them. He surprisingly likes most other people, unless my husband isn’t around, he gets protective over me if men come around me. He likes all dogs, big and small. He jumps at them and is very playful. He’s also very snugly and sweet. I have noticed the tranchea problem with him though and also his eyes water all the time. He’s fixed and still only weighs about 5 lbs. he’s been hard to potty train- he wouldn’t go out into the snow until this year. I usually have to carry him on walks in cold and wet weather because he’s always shivering. he’s inquisitive, likes to wander.. we have to keep a close eye on him at the dog parks because he can wiggle his way under the fence to run after the dogs! Definitely the best dog I ever had, he’s got the most unique personality, he’s not ‘yappy’ for the most part.. just at night when I’m trying to sleep lol.
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.
In a 2000 review by the Centers for Disease Control and Prevention, which examines data from both media reports and from the Humane Society of the United States, pit bull-type dogs were identified in approximately one-third of dog bite-related fatalities in the United States between 1981 and 1992. However, the review notes that studies on dog bite-related fatalities which collect information by surveying news reports are subject to potential errors, as some fatal attacks may not have been reported, a study might not find all relevant news reports, and the dog breed might be misidentified. The AVMA has also noted fundamental problems with tracking breed in dog bite-related fatalities. In a 2013 study of 256 fatalities in the United States from 2000 to 2009, the AVMA determined that valid breed determination was possible for only 17.6% of cases.