The term "mutts" is often used to refer to mixed-breed dogs, or dogs that do not belong to a specific breed. While the term is commonly used in a casual or affectionate manner, it has also been the subject of controversy and debate within the dog breeding and ownership community.

In dogs, "merle" is a pattern of coloring that can appear in the coats of certain breeds. The merle gene causes irregularly shaped patches of solid color to appear amidst a background of a different color. The patches can be any color, but are most commonly shades of blue or brown.

In recent years, advances in commercial genetic testing have made it possible to screen for a wide range of conditions that affect different breeds of dogs. Breed-specific panels can inform on the genetic concerns of a specific breed.

While inbreeding can be beneficial in certain circumstances, such as preserving the purity of a breed or promoting certain desirable traits, it can also have negative effects on the health and well-being of the animals involved if proper precautions are not taken. As such, the ethics of inbreeding in dog breeding is a controversial topic.

Hybrid vigor is defined as the extent of improved performance of an individual trait in the first cross (F1) generation over the parent generation. This is usually expressed as percent improvement. For example, in poultry, an F1 generation might exhibit a 3-9% increase in egg production over the parent populations.

Heritability is a measure of how differences in genes account for differences in traits. Heritability does not indicate what percentage or proportion is determined through genes but rather what percentage or proportion of the variation in a trait in a population can be attributed to genetic differences.

This study aimed to uncover if the variation in tested behavioral characteristics between dogs was heritable. Another goal was to determine if a structured breeding program focused on enhancing working characteristics had any effect on the level of heritability of desired characteristics for service dogs.

This study is a broad review of inbreeding depression research to date, focusing on the genetic mechanisms hypothesized to produce reduced fitness in homozygous populations and hybrid vigor in the offspring of outcrosses.

This study investigates evidence for inbreeding depression in lifespan in dogs at three scales: comparing mixed breed and purebred dogs, across dog breeds, and within one dog breed. It also accounts for the strong effect of body size on lifespan in dogs.

This study compared DNA from two breeds, derived from common founder stock but selected for different purposes, to determine whether the genetics underlying desirable behavior traits could be identified.

This 2014 paper examined the role of mutations in a gene that is known to affect white spotting in dogs. Specifically, this paper looked at polymorphisms (another word for mutations, meaning “different versions”) in the MITF (“microphthalmia associated transcription factor”) gene. The paper looked at the promoter region of the gene.

The papers by Packer et al. (2015, just Packer from here on) and Liu et al (2017, just Liu from here on) on risk factors for BOAS are often pitted against each other when critics and supporters of extreme brachycephaly in dogs engage in discussion.

This study identifies breed-specific conformational risk factors for brachycephalic obstructive airway syndrome (BOAS) in three breeds with extreme brachycephaly: pugs, French bulldogs, and bulldogs.

Different brain areas are associated with controlling different neural processes, and the size of a brain area in a species tends to correlate with how much that species uses that process. For example, olfactory (smell) areas tend to be larger and more complex in animals that depend heavily on smell, while prefrontal cortices are larger in animals with high cognitive abilities, such as humans and primates.

This two-part study investigates risk factors for brachycephalic obstructive airway syndrome (BOAS) by looking first across dogs of diverse breeds and conformations, and second, across brachycephalic dogs.

Large dogs die younger than small ones. This well-known pattern poses a conundrum for evolutionary biologists. Across species, large mammals live longer than their small counterparts; for example, an elephant versus a mouse. In marked contrast, within species large size seems to carry costs in terms of an individual’s life span. The phenomenon has been documented in several species, but the negative relationship between size and lifespan is most evident in the domestic dog.

Choosing perfect homes for your puppies is what I believe to be one of the most difficult parts of being a responsible dog breeder. There are so many “what ifs.” Here are some of the “what ifs” that go through my head when I open up my puppy application for new applicants:

• What if the new families don’t love my puppies as much as I did?

• What if the new families don’t know how to handle illness and emergencies?

• What if the new families don’t ever keep in touch with me?

• What if a family breaches my contract?

What if you felt empowered to choose new families (customers) for your puppies based on an application or interview process that gives you confidence in a new family rather than doubt?

This blog post will cover why it's so important to purchase a puppy from a breeder who does DNA tests on their breeding stock and what to look for when provided a copy. We will cover in a future post why you might consider DNA testing your own dog, especially if you rescued, purchased from a puppy store, or bought a puppy without researching the breeder.  

Inbreeding refers to the breeding of related individuals. Inbreeding depression is the reduced biological fitness (an animal’s ability to survive and reproduce) in a population because of inbreeding. For example, scientists researching the Australian Thoroughbred horse population found that inbreeding led to reduced racing performance.