Some dogs are a mix of many kinds. 
Some dogs come from many different kinds. 

These dogs are very special. They often have many different looks. This is because their parents are different.
Mixes can be very healthy. They can live a long time. They often live longer than purebred dogs. 
Some people even give them funny names. A mix of a Corgi and a Husky might be a "corgsky."
Mixed dogs are wonderful friends to have.
A mongrel is a dog that does not belong to one official breed. 

It can be hard to know a mix's history. They have a lot of genetic variation. This means their traits can change a lot. In 2007, DNA tests became available to help. These tests look for genetic sequences. These are patterns in the dog's body that show its past.
Mixes are often very healthy. This is due to hybrid vigor. This term means that dogs with many different ancestors are often stronger. Purebred dogs can have health problems from inbreeding. Inbreeding is when parents are very closely related. This can cause bad traits to show up. One study found that mixes lived longer than purebreds. On average, they lived 1.2 years longer. 
A mongrel is a dog that does not belong to one official breed. 

People use many different names for these dogs around the world. In the United States, many people prefer the term mixed-breed. In the United Kingdom, mongrel is the special technical word. People often make new names by joining two breed names together. A Corgi and a Husky might become a "corgsky." 
It can be hard to guess a dog's history. Mixed-breeds have a lot of genetic variation. This means their traits can change very quickly. Two black dogs might have babies that look blond. In 2007, DNA tests became available to the public. These tests look for genetic sequences in the dog. These sequences are patterns that show common ancestry. However, the American Kennel Club does not use these tests to decide a breed.
Many people believe mixed-breed dogs are very healthy. This idea is called hybrid vigor. It means dogs with many different ancestors can be strong. Purebred dogs are often made by breeding very similar dogs. This can cause them to have the same health problems. This happens because they share many of the same alleles. Alleles are different versions of genes. Mixing breeds can help avoid these specific health issues.
Scientific studies show that mixed-breeds often live longer lives. One study found that mixed-breed dogs lived 8.5 years on average. Purebred dogs in that same study lived only 6.7 years. Another study in 2013 found a 1.2 year difference. 
A mongrel, also known as a mixed-breed or mutt, is any dog that does not belong to one officially recognized breed. 
To understand a mongrel, one must first understand how purebred dogs are created. Most purebred dogs were originally random-bred populations. Humans then used selective breeding to enhance specific physical or behavioral traits. This process artificially isolates certain groups of genes. Over many generations, this can lead to a lack of genetic diversity. A mongrel is often the result of a more haphazard mating process. This means their genetic makeup is much more varied than a dog from a controlled breeding line. 
There are several ways to categorize these dogs based on their origin and naming. Designer dogs are a specific type created through artificial selection by humans. People often use portmanteaus to name these intentional mixes. A portmanteau is a word made by joining parts of two different names. For instance, a Corgi and a Siberian Husky mix might be called a "corgsky" or a "siborgi." 
Terminology for these dogs varies greatly depending on where you live in the world. In the United Kingdom, "mongrel" is the unique technical term used. In North America, people often prefer the term "mixed-breed" or "mix," though "mutt" is also common. Many cultures use colorful slang based on the dog's environment. In Brazil, they are called "vira-lata," meaning "trash-can tipper." In the Philippines, street dogs are called "askal." In Puerto Rico, they are known as "satos." These diverse names reflect how different societies view and interact with non-purebred dogs.
Determining the exact ancestry of a mongrel can be quite difficult. Because they have so much genetic variation, they do not always look like their parents. For example, two black dogs might produce offspring with blond coats due to recessive genes. In 2007, DNA-based diagnostic tests became available to help solve this mystery. These tests look for specific genetic sequences that are common to certain breeds. However, these tests do not prove purebred ancestry. They only indicate that a dog shares a common ancestor with a specific breed. Even so, the American Kennel Club does not recognize DNA tests for determining breed.
One of the most significant aspects of being a mongrel is the concept of hybrid vigor. This theory suggests that dogs with varied ancestry are generally healthier than purebreds. In purebred lines, breeding very similar dogs can cause them to carry many of the same alleles. Alleles are different versions of genes. If a breed is small, it may lack genetic diversity, making the population fragile. Sometimes, humans select for a physical trait that is linked to a genetic disorder. This artificial selection can cause the disorder to duplicate within the breed. 
Scientific studies have provided concrete evidence regarding the health advantages of mixed breeds. A German study found that mongrels often require less veterinary treatment. Research in Sweden showed that mongrels are less prone to many diseases and fall into a low-risk category for death. Data from Denmark also suggests mixed breeds have greater longevity. One major study of 23,533 pet dogs found a significant difference in lifespans. The median age at death for mixed-breed dogs was 8.5 years. In contrast, the median age for purebred dogs was only 6.7 years. A 2013 study confirmed that mixed breeds live, on average, 1.2 years longer than purebreds. This longevity is closely linked to the benefits of genetic diversity and the avoidance of inbreeding.
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