King Rat

13-25 lbs
United States
Cavalier King Charles Spaniel
Rat Terrier
The King Rat is a hybrid mix between the Cavalier King Charles Spaniel and the Rat Terrier. While this dog isn't actually king of the rats, he is a very sophisticated and intelligent breed who loves nothing more than to spend every waking moment with his owners. The King Rat is a small dog with a very big personality who is capable of being both a calm and loving companion dog, as well as a hunter and exercise buddy. Because both of the King Rat's parent breeds love to please their master, you can expect that the King Rat himself will be easy to train and fun to play with. You shouldn't need to worry about your furry friend ignoring your commands or running away from home when you have a King Rat; they love to stay close to their humans and have a strong sense of loyalty that drives them to please you in any way that they can. If you are looking for a breed that is great for a first time dog owner, who won't bother neighbors with a constant barrage of barking, and is an excellent mix of calm and energetic, the King Rat may be the perfect pet for you.
purpose Purpose
history Date of Origin
ancestry Ancestry
Cavalier King Charles Spaniel and Rat Terrier

King Rat Health

Average Size
Male King Rat size stats
Height: 10-18 inches Weight: 13-25 lbs
Female King Rat size stats
Height: 10-18 inches Weight: 13-25 lbs
Major Concerns
  • Patellar Luxation
  • Deafness
  • Progressive Retinal Atrophy
  • Hip Dysplasia
  • Lens Luxation
  • Heart Disease
  • Syringomyelia
  • Mitral Valve Dysplasia
Minor Concerns
  • Demodectic Mange
  • Progressive Retinal Atrophy
  • Cataracts
  • Retinal Dysplasia
  • Hip Dysplasia
  • Epilepsy
  • Skin Allergies
  • Dental Disease
  • Legg-Calve-Perthes Disease
  • Microphthalmia
  • Corneal Dystrophy
Occasional Diagnoses
  • Urolithiasis
  • Ichthyosis
  • Diabetes
Occasional Tests
  • Knee
  • Hip X-Rays
  • Heart
  • Dna For Pra
  • Dental Examination
  • Skin Evaluation
  • Eye Examinations
  • Hearing Tests

King Rat Breed History

Because the King Rat is a new hybrid breed, he doesn't have very much information regarding his origin. Thankfully, we can glean a few important details about why this breed may have been created based on his parent breed's backstory. Both the Cavalier King Charles Spaniel and the Rat Terrier have been around for quite some time, and have a lot of history about the what, when, where, and why of their creation. For instance, the Cavalier King Charles Spaniel originated just like all spaniels; from Spain. Over time, these popular dogs made their way across the world and the predecessors of the Cavalier landed in England. The toy spaniels (as they were known) were popular all throughout the 16th, 17th, and 18th century as royal companion dogs. Some of the most famous people to own the little spaniels were monarchs such as Queen Mary and her son, Charles I. Both Charles I and Charles II loved these spaniels and took them around everywhere, thus this breed was quite the symbol around England. Unfortunately, just like many royal trends, when King Charles II and King William came to the throne, the King Charles Spaniel almost faded out of existence. This was because the new king's favorite dog was the Pug and people began to breed the two breeds together; creating the Cavalier's appearance that we know and love today, with a more squashed nose and domed head. The once beloved toy breed of spaniels would have been completely forgotten, if it wasn't for a certain rich American by the name of Roswell Eldgridge. In the year 1920, Eldgridge offered a reward to anyone who could re-create the Spaniel breed that Eldridge had seen in 17th and 18th century portraits. Eight years later, a breeder by the name of Mostyn Walker presented the first Cavalier King Charles Spaniel, which were so named to distinguish them from the flat faced, domed headed version of the King Charles Spaniel. While it took quite some time for this breed to be accepted once again, in 1945 the American Kennel Club recognized the breed and they are now used as show dogs and companions all over the world. The Rat Terrier is an all American breed who came about due to the combination of the Fox Terrier, Bull Terrier, Manchester Terrier, and the Old English White Terrier. All of these unique traits were combined into one in order to create a small, lightweight terrier who was excellent at catching vermin and other prey on farms. In the Midwest, the Rat Terrier was also bred with Whippets and Greyhounds to boost the breed's speed and athletic nature in order to keep up with the jackrabbit problem in that area. You would think that this versatile little dog would stop there, but he didn't! In order to increase his sense of smell, the Rat Terrier was then bred with the Beagle to increase his oriented nature and allow his sense of smell to be extremely on point. Needless to say, all of this mixing and matching allowed the Rat Terrier to be a strong, intelligent, and quick little breed; perfect for hunting. In fact, the Rat Terrier was so good at his job, that he even earned himself a place in the White House! President Teddy Roosevelt loved the Rat Terrier, which is why another name for the dog is the Teddy Roosevelt Terrier. Surprisingly enough, the Rat Terrier is a relatively new breed at wasn't recognized fully by the American Kennel Club until the year 2013. This dog has always been a companion and working animal, and he still is to this very day.

King Rat Breed Appearance

The King Rat is a hybrid breed, meaning that his appearance may vary greatly even within the same litter. Depending on which parent genes are stronger, the King Rat may have tall ears like the Rat Terrier, or loose ears like the Cavalier. While such traits can differ quite a lot, the typical appearance of the Rat Terrier is that of a small dog with a short body, small legs, a slightly domed head, and a short but prominent muzzle. As the Rat Terrier has a longer muzzle, that seems to be most common on the King Rat, overcoming the smaller nose of the Cavalier. The coat of this breed tends to be short and soft, available in a variety of piebald colors, and sheds seasonally. The eyes are big and round, with an intelligent light that shines brightly within the gorgeous dark brown coloring.
Eye Color Possibilities
brown King Rat eyes
Nose Color Possibilities
black King Rat nose
brown King Rat nose
Coat Color Possibilities
white King Rat coat
red King Rat coat
black King Rat coat
brown King Rat coat
pied King Rat coat
Coat Length
Short Medium Long
Coat Density
coat density
Sparse Normal Dense
Coat Texture
coat texture
King Rat straight coat texture
Straight Wiry Wavy Curly Corded

King Rat Breed Maintenance

The shorter coat of the King Rat makes him a very low maintenance dog. The only major issue is that he does tend to shed often, so brushing is a must in order to keep the shedding to a minimum. Using a simple slicker brush, groom your dog at least once a week to remove any loose hair or dirt that may be lying on the body. Bathing only needs to occur once a month, or if your King Rat gets into something that he shouldn't. This breed does not have a bad doggy odor! The last step in the grooming process is to maintain your dog's feet. Be sure to clip his nails every few weeks to keep the paws healthy and snag free. If you hear the nails clicking against the floor, it's time for a trim.
Brushes for King Rat
Slicker Brush
Slicker Brush
Nail Clipper
Nail Clipper
Brushing Frequency
fur daily fur weekly fur monthly
King Rat requires weekly brushing
Daily Weekly Monthly

King Rat Temperament

The King Rat is a very sweet, loving, loyal, and intelligent dog. While the balance between the Cavalier and the Rat Terrier keep him from being to over-energetic, he isn't a couch potato either! This little dog will love nothing more than to spend as much time as possible with his master. Most likely, he will follow you all over the house; ready to play when you are, and ready to be calm when you ask it of him. Because the King Rat is not a big barker, he makes the perfect dog for any apartment home with close neighbors. His eager to please disposition and friendly attitude makes the King Rat a great choice for new dog owners, as potty training and teaching manners won't be too much of a hassle. The Terrier is a naturally stubborn breed, so there may be a few instances where this trait will shine through; but for the most part, the King Rat is a gentleman who is ready to make you proud! He would make a great companion for anyone with kids, other pets, or even the elderly. Just be sure that he is socialized early and has room for exercise to keep him well behaved.

King Rat Activity Requirements

The King Rat is an excellent balance between calm and energetic. He is this way because the Cavalier is a more reserved breed, who was built for palaces and royalty; so a calm and gentle companion who likes to play now and again. The Rat Terrier, on the other hand, is a Terrier to the bone and was bred to hunt and maintain a farm; therefore, this is a more energetic and high energy breed. Thankfully, the King Rat doesn't take after one side more than the other in most cases. This breed will be perfectly happy with a long walk once a day, and a good round of fetch or training out in the yard. Because of this, the King Rat is the perfect companion for older people and those who don't have a big house or yard. Just keep in mind that due to his intelligence, training and regular mental stimulation will be important to keep your King Rat from getting bored, as well as maintaining his manners.
Activity Level
low activity medium activity high activity
Low Medium High
Rec. Walk Mileage Per Week
9 miles
walk mileage
Minutes of Activity Per Day
60 minutes
activity minutes

King Rat Food Consumption

Cups Per Day
1 cups
cup per day cost
Daily Cost
$1.00 - $1.00
food bowls daily cost
Monthly Cost
$25.00 - $30.00
food bag monthly cost

King Rat Height & Weight

6 Months
Male King Rat size stats at six months
Height: 10.0 inches Weight: 14.5 lbs
Female King Rat size stats at six months
Height: 10.0 inches Weight: 14.5 lbs
12 Months
Male King Rat size stats at 12 months
Height: 13.0 inches Weight: 18.5 lbs
Female King Rat size stats at 12 months
Height: 13.0 inches Weight: 18.5 lbs
18 Months
Male King Rat size stats at 18 months
Height: 16.5 inches Weight: 23.0 lbs
Female King Rat size stats at 18 months
Height: 16.5 inches Weight: 23.0 lbs

King Rat Owner Experiences

6 Months
4 People
Walks in the neigborhood
Puzzle Toys
She is a great puppy! She has the energy of a terrier more so due to her puppyhood. But she does like to sit with you as well. She LOVES to play fight with my 3 year old chorgi. She does well with positive praise and is food motivated.
2 years, 6 months ago
5 Months
2 People
House & Yard
he is a great dog and very lovable
4 years, 5 months ago
8 Years
3 People
He is an outgoing friendly dog that loves all people and all animals. Great with all dogs and cats. Great with kids. Loves to play. Very food motivated. Not afraid of anything. Quiet, rarely barks. Has a high pray drive and can not be trusted off leash. Gets over excited and wants to chase squirrels. Has a short thick coat. Clean, good smelling dog. Does shed. Overall, is a great small ( 18 lb) family dog.
5 years, 8 months ago
20 Years
9+ People
jacks gay
because it's dead AHHHHHHHHHHHHHHH
4 years, 1 month ago
Book me a walkiee?
Sketch of smiling australian shepherd