The “Little Lab” Kept Growing — Then His DNA Revealed A Rare Surprise

Desirea Auten knew what kind of dog she wanted by her side.

The professional trainer was searching for a Labrador retriever she could prepare to become a steady, trustworthy working dog.

Then a photo of a little black puppy with soulful eyes caught her attention.

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The puppy was the last of his litter still waiting to be adopted through Retriever Rescue of Las Vegas.

The organization rescues dogs from the meat trade and breeding farms in Korea, bringing them to the United States for a chance at safe, loving homes.

Auten was told the puppy was a purebred black Labrador of the English style, which sounded like exactly what she had been hoping to find.

Labradors are often chosen for assistance and service work because of their size, temperament and trainability.

To Auten, this puppy seemed like her dream working dog.

She agreed to foster him and gave him a surprisingly fierce name: Venom.

At first, the arrangement was only supposed to be temporary.

Auten had spent decades rehabilitating dogs with behavioral challenges, so fostering and training Venom before finding him a permanent family seemed like a natural plan.

She also already had a beloved Saint Bernard who assisted with her training work and was adored throughout their Las Vegas neighborhood.

Venom initially spent his days keeping the Saint Bernard company and learning basic manners.

He observed the older dog, adjusted to life inside Auten’s home and quickly showed how eager he was to learn.

Auten still assumed she would eventually adopt him out, but that plan became harder to imagine as his personality emerged.

Venom was social, intelligent and remarkably promising.

Auten could already see that the little puppy had the potential to become an exceptional partner.

Then tragedy changed everything.

Her Saint Bernard suffered a health crisis and passed away, leaving Auten grieving the loss of both a cherished companion and an important part of her work.

Venom could never replace the dog she had lost, but his presence took on new meaning during that painful time.

Soon afterward, Auten decided to make his place in the family official.

The foster puppy was staying for good.

As Venom settled into his permanent home, Auten began to discover that his value as a working dog went far beyond the qualities she had expected from a Labrador.

He had a special gift for helping dogs who were fearful, anxious or reactive.

Some frightened dogs struggle to meet unfamiliar animals, while others become tense around new people or environments.

Venom approached those situations without creating additional pressure.

He was friendly and interested, but he could also remain calm while another dog worked through uncertainty.

In training terms, Venom could serve as a “neutral dog,” providing a safe and steady presence during challenging interactions.

A neutral dog does not crowd, provoke or overwhelm an anxious animal.

Instead, the dog demonstrates that sharing space with others does not have to lead to conflict or danger.

Venom seemed to understand that responsibility naturally.

When a scared dog watched him meet someone safely, that dog could begin to feel more comfortable approaching.

When a reactive dog expected trouble from another animal, Venom showed that peaceful contact was possible.

“He helps dogs realize that they can have friends or at least learn how to be at peace with other dogs and even other humans,” Auten told The Dodo.

Because Venom was so social, she often used him to show nervous dogs that it was safe to meet someone.

His calm behavior could help another dog take a small but meaningful step toward trust.

A relaxed body, a curious sniff or a willingness to remain nearby could mark the beginning of real progress.

Auten had wanted a capable working dog, and Venom was proving that he could fill that role beautifully.

However, another part of his story was becoming increasingly difficult to explain.

Venom would not stop growing.

His legs became longer, his body rose higher and his proportions looked less like those of the English-style Labrador Auten thought she had brought home.

Month after month, the supposedly little Lab continued stretching into a tall, lean and surprisingly large dog.

Auten and her son began documenting his growth spurts in photographs.

Each new picture made the mystery harder to ignore.

Venom still had a glossy black coat and some recognizable Labrador features, but the rest of him suggested there was something else in his family tree.

Auten joked that he had a head almost like a greyhound, complete with floppy ears.

His leggy frame and increasing size reminded her more of a giant breed such as a Great Dane.

“His DNA has been a running joke,” Auten said.

Whatever his ancestry might be, it had not changed the gentle personality that made him so effective around vulnerable dogs.

Venom remained friendly, composed and closely connected to Auten even as he began towering over many of the animals he helped.

Still, curiosity eventually won.

Because Venom had come from Korea, Auten knew he could have breeds in his background that were uncommon in the United States.

She wanted a DNA test capable of identifying international and more obscure breeds, rather than one limited to more familiar breeds.

Auten selected a test from Embark Vet, swabbed the inside of Venom’s cheek and mailed the sample for analysis.

Then she waited to learn what had been hiding behind his soulful face and ever-growing body.

When the results arrived, one part of the answer was familiar.

Venom was indeed part Labrador retriever.

The other half was something Auten had not expected at all.

Venom was half Tosa Inu, a rare Japanese mastiff breed known for its enormous stature.

Suddenly, the puppy’s dramatic growth and powerful frame made far more sense.

He had not simply become an unusually tall Labrador.

Half of his ancestry came from a breed built on a much larger scale.

The result explained Venom’s size, but it did not alter anything important about who he was.

He was still the affectionate dog Auten had welcomed into her home and the steady helper fearful dogs could trust.

His DNA report simply gave a name to the physical traits that had puzzled his family for months.

The test also uncovered another unexpected part of Venom’s past.

He had a huge extended family living in the United States.

According to Auten, the report included five pages of relatives, an astonishing number for a rescued dog whose early history had stretched across an ocean.

Those digital connections soon became real ones.

Venom has reunited with some of his siblings through the training and obedience classes Auten teaches.

One of his sisters regularly stays with Auten and Venom when her family travels.

For a dog who arrived with so many unanswered questions, those reunions created a remarkable link to his beginnings.

Venom now had more than a permanent home and meaningful work.

He also had opportunities to spend time with members of the same family from which he had once been separated.

Today, Venom continues assisting dogs who need help feeling secure around other animals and humans.

His imposing size might make him an unexpected choice for delicate training situations, but his behavior tells frightened dogs something different.

He does not use his height or strength to intimidate them.

Instead, he quietly demonstrates how to remain peaceful in another dog’s company.

His work often unfolds through moments that may look small from the outside.

A scared dog might take one step closer, allow its body to soften or watch Venom interact with a person without retreating.

For an animal accustomed to responding with fear, each of those moments can represent meaningful progress.

Venom helps create the calm conditions in which that progress becomes possible.

Auten originally pictured her ideal working partner as a purebred black Labrador with familiar proportions and predictable traits.

Instead, she found a dog who grew far beyond expectations and carried the DNA of a rare Japanese mastiff.

The surprise did not make Venom less suited to the life she had imagined.

If anything, his unusual background became one more part of what made him uniquely valuable.

He had arrived as a temporary foster puppy shortly before Auten experienced a devastating loss.

He stayed as a permanent family member and developed into a gifted helper for dogs facing fears of their own.

The little black puppy from Korea became a gentle giant who could teach other animals that unfamiliar dogs and people might be safe.

His DNA explained his long legs, large frame and seemingly endless growth, but no laboratory result could measure his patience or the trust he inspired.

Auten set out to find her dream Labrador and ended up with something she never could have planned.

Venom was not exactly the dog she expected, but he proved to be the companion and working partner she had been searching for all along.

He may be half Labrador and half Tosa Inu, but to Auten, the most important conclusion is much simpler.

Venom is 100 percent good boy.