Parson vs. Jack vs. Russell Terrier: Sorting Out These Easily Mixed-Up Breeds

The Parson, Jack, and Russell Terriers are frequently confused dog breeds. Get the low down on the differences between them!

By: Kelly Caldwell

Last Updated:June 25, 2025

Is it a Jack Russell or a Parson Russell Terrier? Or is it simply a Russell Terrier? What the heck is the difference? Let's find out.

Adorable, energetic, and smart, these mostly-white, small little terriers strut along with such big attitudes. Many refer to them as Jack Russells, but what you're most likely seeing is a Parson Russell Terrier or a Russell Terrier, at least so far as the American Kennel Club (AKC) is concerned.

Parson Russell TerrierEric Isselée/AdobeStock

Formerly Known as the Jack Russell Terrier: A Contentious Name Change

First off, let's get the contentious business out of the way. According to the AKC and CKC, the Parson Russell Terrier is the same as the Jack Russell Terrier—it's the same breed/standard, just with a name change. Other breed clubs, like the JRTCA, disagreed with the name change, and have their own standard for the breed they still call the Jack Russell Terrier. According to the AKC though, there is no longer a recognized breed called the Jack Russell Terrier.

According to the AKC and CKC, the Parson Russell Terrier is the same as the Jack Russell Terrier—it's the same breed/standard, just with a name change.

Early Origins

The Jack Russell Terrier, Parson Russell Terrier, and Russell Terrier share a common ancestry that is tied closely with the development of the Fox Terrier—an English breed that emerged in the 18th century.

Fox hunts were popular at that time, and hunters needed tough, energetic, determined little dogs who could locate foxes and drive them out of their dens. Fox Terriers were bred from several types of terriers, including the Bull Terrier and the now-extinct English White Terrier.

Early on, Fox Terriers were larger and more varied in appearance than they appear today. A predominantly white coat was valued as it helped keep the dogs visible during hunts. Coat colour aside, early breeding efforts focused on functionality and temperament—not a strict adherence to any particular look.

By the 1870s, fanciers decided to put together a breed Standard to ensure the Fox Terrier's type and temperament remained consistent.

Putting the “Jack” in “Jack Russell:” The Clergyman who Changed Everything

During the Fox Terrier's development, one man had a different vision of what might constitute the ideal hunting companion. Reverend John “Jack” Russell was an Englishman with a passion for fox hunting. An avid sportsman, he bred Fox Terriers, but wanted to venture down a slightly different path.

To him, the ideal hunting terrier would be small, agile, tireless, and absolutely relentless in their pursuit of quarry. The size he sought was small—small enough to venture into dens to root out foxes or other small animals.

Life on White/Bigstock

While a mostly white coat was desired, Russell's passion project was always focused on personality and temperament. A specific physical specimen wasn't the goal; appearance took a back seat to functionality. A white-and-tan terrier named 'Trump' is considered the mother of his breed—a dog with high energy and strong prey drive, but a very affectionate temperament.

Ultimately, his efforts led to the recognition of a distinct breed—a small, agile terrier with great stamina, and an exuberance for hunting and life in general. The fearless dogs he bred were referred to as Jack Russell Terriers.

AKC Recognition

Over time, both the Fox Terrier and the Jack Russell Terrier took on more standardized appearances and temperaments. In the case of the Fox Terrier, the distinction between smooth and wire-haired varieties was made, for example.

While Jack Russells had gained recognition by the mid-1800s for their hunting abilities and distinctive characteristics, it wasn't until the 20th century that formal breed standards began to emerge.

The AKC recognized the Jack Russell Terrier in 1997. In 2004, amid no small amount of controversy, the AKC renamed the breed the Parson Russell Terrier.

It's no surprise that these dogs were well received in America, but getting AKC recognition took some time. The Jack Russell Terrier Club of America (JRTCA) was already registering dogs and their standards were very strict. As a result, many fanciers felt there was no good reason to seek AKC recognition. Not everyone agreed, and a small group of dedicated fanciers spent a decade working towards AKC recognition. The AKC recognized the Jack Russell Terrier in 1997. In 2004, amid no small amount of controversy, the AKC renamed the breed the Parson Russell Terrier, to differentiate the breed from other small terriers who were casually referred to as Jack Russells but didn't meet AKC breed standard. (While the AKC seeks to promote breed standards with conformation of temperament as well as type, the JRTCA's primary focus is on the working ability and functional standard of the dogs they register. From their perspective, physical conformation is less important than temperament traits like intelligence, athleticism, and hunting instinct so there is more variety in the look of the dogs registered.)

Introducing the Russell Terrier

Russell TerrierThomas Pitera © American Kennel Club

The Russell Terrier—recognized by the AKC in 2012—is a smaller version of the Parson. Most of the breed's development occurred in Australia, where the breed's uses differed from those in England. As a result, fanciers who loved the Parson Russell Terrier sought the creation of a more compact version with versatility to excel not just in hunting, but in other sporting activities.

The Russell Terrier—recognized by the AKC in 2012—is a smaller version of the Parson.

The similarities between the two breeds, both physically and in terms of temperament, are significant. However, while the differences may seem small, both fanciers and the AKC deemed them important enough to acknowledge them as two unique breeds.

Key Differences

Let's take a look at the differences, as defined by the AKC standards.

Size:

Parson Russell Terrier (formerly known as the Jack Russell Terrier): Ideal height is 14 inches at the highest point of the shoulder blade for males; 13 inches for females. Body shape is rectangular, medium-boned, and very proportionate.

Russell Terrier: Height ranges from 10 to 12 inches at the withers for both males and females. The Russell Terrier is more compact than the Parson Russell Terrier.

Coat:

Parson Russell Terrier: Typically, the coat is hard and wiry, with a straight or slightly waved appearance. The coat may be white, predominantly white with black or tan markings—or tri-colour.

Russell Terrier: Coat may be smooth, broken, or rough. There is no preference to markings, but the coat must be at least 51% white and can have black or tan markings.

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Head:

Parson Russell Terrier: Strong and well-proportioned, the skull is flat with a defined stop (the point where the forehead meets the muzzle.) The muzzle is moderately narrow and strong.

Russell Terrier: Slightly broad, flat, and with a well-defined stop.

Ears:

Parson Russell Terrier: V-shaped ears drop forward close to the cheeks.

Russell Terrier: Small V-shaped ears fold forward close to the head.

Temperament: Russell Terrier vs Parson Russell Terrier

With their shared ancestry as working terriers, it's no surprise that both breeds are highly intelligent and tend to learn very quickly. They are independent by nature which, combined with trademark terrier stubbornness, can certainly make training a challenge.

Social dogs by nature, both the Parson Russell and the Russell Terrier are happiest when in the company of people. These affectionate dogs form strong bonds with their people. It's important to socialize these terriers from an early age. Plenty of exposure to other people and pets will help ease what is a naturally territorial nature. They're also a playful pair, interested in anything and everything that's going on around them at all times.

Lubo Ivanko/AdobeStock

Is the Parson Russell or Russell Terrier Right for You? Some Practical Considerations

How do you feel about barking? Because both of these terriers like it—a lot.

These highly alert dogs have a very keen sense of their surroundings. Nothing slips past the Parson Russell or Russell Terrier. So, if you're looking for a calm and quiet dog, keep looking. While the Parson Russell is noted as a more moderate barker, both are high-energy companions. If you're looking for a dog who'll always let you know what's going on and who's arrived at your house, either is a great choice.

Both of these terriers bark—a lot.

Another consideration is that these dogs love to dig. Are they looking for something specific? Often, no. Just remember they were bred to dig through holes to reach dens. So, garden enthusiasts, take note. Neither of these tenacious terriers will share your appreciation of your prize roses. If a pristine yard and garden is important to you, these dogs likely aren't an ideal choice.

Life on White/Bigstock

Speaking of yards, because their prey drive remains so keen, a fenced-in yard is advised. The smaller Russell Terrier may be more adaptable for small spaces or apartments, but ideally both breeds should have a secure, fenced-in yard and some room to roam and play.

Finally, when it comes to children or other pets in the home, a bit of caution is in order. Early socialization and ongoing training are crucial to ensure that both breeds develop positive relationships with all family members—and other pets. While affectionate and playful with kids, their energy level is high. This, combined with the terrier tendency to react in kind to rough treatment, means that supervision is important to prevent accidental knocks and ensure that the kids are treating their dog with gentle hands.

Get to Know the Parson Russell and Russell Terriers

Energy Level and Exercise Requirements

While the Russell Terrier is a smaller dog, if you're thinking that his energy requirements shrink with his size: think again. The Russell may be a bit more manageable, but they most certainly require lots of exercise and mental stimulation to thrive. A couple of long walks a day and several rounds of play time are minimum exercise requirements. Left alone for long periods, or without adequate physical and mental outlets, both breeds can be very destructive. A tired terrier is a good terrier, as the saying goes.

Parson Russell Terriers tend have a somewhat calmer demeanor than their intense counterparts, but both breeds are intelligent, independent, and quick learners. Easy to train? Not so much.

Training

It's safe to say that the entire Terrier Group has a bit of stigma around trainability. Smart, independent, and notoriously stubborn, these dogs don't exactly wake up thinking of new ways to please their owners. Patience, positive reinforcement, and a great deal of practice are in order.

Kristyna Mrazkova/Shutterstock

Would I suggest either of these breeds for a novice or first-time pet owner? Probably not. There's a lot of dog in these little guys. They require a great deal of time, effort, and understanding.

Along with socialization, owners should commit to ongoing and consistent training from a very early age. Training methods should solely focus on positive reinforcement techniques, and you must meet the exercise needs of these dogs in order for them to be happy and well-behaved.

Out and About

Just because you won't be taking them out on a fox hunt doesn't mean that you can't give either of these breeds plenty of physical and mental stimulation. What are they suited for? Name it!

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Agile, fast, and highly energetic, activities such as Agility and Flyball come naturally to these terriers. Even more natural? Simulated hunting activities such as Earthdog. These activities can give your dog a chance to do what comes naturally—in a controlled, more humane manner.

Health Considerations

While these are relatively healthy breeds with a lifespan averaging 13 to 15 years, as with all purebreds they can be prone to some genetic illnesses. hip dysplasia, for example, is something to be aware of.

Along with common ancestry, the Parson Russell Terrier and the Russell Terrier share many traits. Intelligent, agile, and tenacious—they've got everything they need to be valuable hunting companions. But in the home, they're affectionate, fun, and eager to participate in just about anything. They may be small in stature, but they're formidable in spirit. It's no surprise that these two terriers have won the hearts of so many dog-lovers around the world.

Kristyna Mrazkova/Shutterstock

At-a-Glance Profiles:The Parson Russell & The Russell Terrier

The Parson Russell Terrier is the taller of the two, with an ideal height of 13 to 14 inches at the withers, while the Russell ranges from 10 to 13.

Both breeds emerged from Jack Russell Terrier, bred in England during the 1800s to assist as a tireless, agile dog to aid in fox hunts.

These dogs require plenty of daily physical and mental stimulation to thrive. Ideally, give these two a fenced-in yard where they can run and play.

Average. While low maintenance in general, they do shed seasonally and, with the white coat, regular bathing will be in order.

If you like either of these terriers, you might consider the Wire Fox Terrier, the Rat Terrier, or the Smooth Fox Terrier.

» Read Your Breed. For more breed profiles, go to moderndogmagazine.com/breeds