The Merle Cockapoo: A Comprehensive Guide for Dog Lovers
As a lifelong dog lover and veterinarian, I‘ve seen countless adorable cockapoos over the years. With their teddy bear faces, low-shedding coats, and famously friendly personalities, it‘s no wonder they have skyrocketed from a niche hybrid to one of the most popular companion dogs in the U.S. and U.K.
In the past decade, a new trend has emerged in cockapoos: the merle color pattern. Merle cockapoos have taken social media by storm with their striking marbled coats and bright blue eyes. But as much as I understand the aesthetic appeal, I also have serious concerns as a veterinary professional about the ethics and potential health impacts of breeding merle cockapoos.
In this in-depth guide, I‘ll share my expertise to help current and prospective cockapoo owners understand the full story behind the merle cockapoo craze. We‘ll cover the origins of cockapoos as a hybrid breed, how the merle color pattern emerged in the breed, and the genetic and health implications of merle breeding. Finally, I‘ll offer my advice for finding and raising a healthy, well-bred cockapoo of any color.
Cockapoo History and Hybrid Vigor
The first documented cockapoo breeding occurred in the 1960s, making it one of the earliest "designer dogs." The intent was to create an outgoing, low-shedding companion dog by crossing a cocker spaniel with a poodle (usually a miniature or toy poodle for a smaller size).
As with many hybrid breeds, cockapoos are often marketed as having "hybrid vigor," meaning they are healthier than their purebred parents. While there is some scientific evidence that first-generation hybrids can have lower incidences of certain genetic disorders, the effect diminishes with each successive generation[1].
Cockapoos can inherit health issues common to both cocker spaniels (eye disorders, hip dysplasia, heart disease) and poodles (eye disorders, hip dysplasia, thyroid issues). Responsible cockapoo breeders aim to minimize these risks through genetic testing of parent dogs.
The Merle Gene: Beautiful but Risky
The merle pattern is caused by a mutation in the PMEL gene that controls pigment distribution[2]. It creates mottled patches of diluted color, typically in shades of gray, black, and tan. While striking, the merle gene is also associated with a range of developmental abnormalities, including:
- Microphthalmia (abnormally small eyes)
- Colobomas (missing pieces of ocular tissue)
- Increased risk of glaucoma and cataracts
- Congenital deafness (especially in dogs with large amounts of white fur)
A 2006 study found that 10% of merle-colored dogs had hearing impairment, compared to 2% of non-merles[3]. The risk is even higher in double merles (dogs with two copies of the merle gene), which have a 25% chance of being born blind, deaf, or both.
This is why the merle gene is so controversial in cockapoos. Neither cocker spaniels nor poodles naturally carry merle, meaning a purebred cockapoo cannot genetically be merle. The only way to produce a merle cockapoo is to cross a cocker spaniel, poodle, or cockapoo with a breed that does have the merle gene, most often:
- Australian shepherds
- Border collies
- Shetland sheepdogs
- Cardigan Welsh corgis
So a "merle cockapoo" is, in actuality, a cocker spaniel/poodle/Australian shepherd mix or a similar combination of at least three breeds. This is rarely disclosed by breeders advertising merle cockapoos.
The Problem with Merle-to-Merle Breeding
Most breed clubs forbid the registration of merle-to-merle breedings to avoid producing disabled double merle puppies. However, because the cockapoo is not an officially recognized breed, it has no governing body to restrict merle-to-merle breeding.
Unethical breeders looking to cash in on the merle cockapoo trend often mate two merle cockapoos or a merle cockapoo with a merle from another breed. The resulting merle puppies sell for prices of $2500-5000 (far more than a non-merle cockapoo), but at the cost of a high chance of impaired puppies being born and potentially suffering.
Merle Cockapoos as Family Pets
For dog lovers who have their heart set on a merle cockapoo, it‘s important to be fully prepared for the extra care and costs that may be required, such as:
- Regular vision and hearing screenings
- Learning to communicate with hand signals if the dog is deaf
- Treating chronic eye conditions like dry eye or glaucoma
- Extensive genetic testing of both parent dogs (not just one)
- Training and socializing a dog with sensory impairments
Cockapoos as a whole still tend to be wonderful companion animals: playful, trainable, affectionate, and adaptable to many living situations. Their grooming needs depend on their coat type but are generally moderate.
"I love my merle cockapoo‘s fun-loving spirit and how she always wants to be where the family action is," says Sarah, a mom of two from Portland, Oregon. "But I do wish I had known more about her potential health needs before bringing her home. Her vision and hearing are okay for now but I know they could decline as she ages."
Finding a Healthy Cockapoo
If you‘re considering adding a cockapoo to your family, I recommend looking for:
- Breeders who perform genetic health screening on parent dogs and puppies
- A puppy contract with a health guarantee against congenital defects
- Sires and dams with Orthopedic Foundation for Animals (OFA) certifications
- Breeders involved in therapy dog programs or performance events, not just breeding for color
- Opportunities to meet the puppy‘s parents and see their living conditions
You can also adopt an adult cockapoo from a rescue organization that does thorough heath and temperament evaluations. This lets you avoid some of the uncertainty around a puppy‘s ultimate size, coat type, and health.
The Bottom Line
As a dog lover myself, I understand the impulse to seek out an adorable, unique-looking pup. But as a veterinarian, I‘ve also seen the heartbreak of owners realizing too late that their merle cockapoo‘s beautiful coat came with a high risk of health issues and special needs.
Cockapoos as a breed are delightful companion dogs with the potential to bring joy to many families. But prioritizing health, temperament, and the compatibility of an individual dog with your lifestyle will always be a better bet than being swayed by designer coat colors.
With responsible breeding practices and informed, prepared owners, cockapoos of all colors will continue to thrive as one of America‘s most beloved hybrid breeds for decades to come.
References
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Hybrid vigor in dogs: is it a reality? Institute of Canine Biology.
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Hédan, B., Cadieu, E., Botherel, N. et al. Identification of a Missense Variant in MFSD12 Involved in Dilution of Phaeomelanin Leading to White or Cream Coat Color in Dogs. J Hum Genet 60, 437–445 (2015).
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Strain GM, Clark LA, Wahl JM, et al. Prevalence of deafness in dogs heterozygous or homozygous for the merle allele. J Vet Intern Med. 2006;20(4):788-794.
