Small crates, crematories and an unusual text: How authorities found a dog trainer was responsible for the deaths of 11 dogs

From Happy Training to Tragic Loss: The Unveiling of a Dog Trainer’s Cruelty

Small crates crematories and an unusual – Authorities recently uncovered a grim pattern of animal mistreatment linked to Tony Sit, a 54-year-old dog trainer from Irvine, California, and his 24-year-old girlfriend, Tingfeng Liu. The case, which led to their convictions last week, revealed a web of neglect and deception that claimed the lives of nearly a dozen dogs. Sit, who operated Happy K9 Academy, was accused of placing animals in small crates inside a sweltering cargo van, where they succumbed to heatstroke. Liu was charged for her role in facilitating the disposal of the deceased pets through crematory services. The couple faces sentencing on July 10, with potential prison terms of up to 14 years for Sit and four years for Liu.

The Ill-Fated Journey of Miko

Miko, a one-year-old shepherd mix, had been raised with care, his physical growth marking the transition from puppyhood to adulthood. By the time he was entrusted to Sit’s training, his body had reached a size where his nose could nearly graze a treat bag at waist height, and his paws, once oversized for his age, had adjusted to his large-breed heritage. His owner, Alexander Kostyukevich, had discovered Sit through Instagram, drawn by the trainer’s online presence. After a positive session with Sit and another owner, Kwong Chun Sit, the decision was made to entrust Miko to the academy. However, just three days later, Kostyukevich received a text message that would forever change his perspective on pet care.

“I’m so sorry to let you know that Miko passed away peacefully during the night while resting. There were no signs of pain or struggle, and it was truly unexpected. I am deeply saddened by this loss.”

The message, sent by Sit on June 18, 2025, painted a picture of calm and care, but it concealed the reality of Miko’s demise. Kostyukevich, who had believed the trainer to be reliable, was left in disbelief. What followed was a chilling investigation that led authorities to crematories, pet disposal services, and a van reeking of bleach and feces, where the deaths of multiple dogs were hidden.

The Investigation Begins

Casey Pickett, an animal services officer with the Irvine Police Department, was the first to step into the fray. After Kostyukevich reported Miko’s death, Pickett began tracing the evidence. She contacted Sit, who initially claimed only two dogs had died in their sleep. But as the investigation deepened, the number of casualties grew. Pickett learned that a service called Mobile Pet Cremations had picked up Miko and another dog, Ziggy, and halted their cremation process upon receiving information from law enforcement.

Further inquiry revealed a larger scale of neglect. An employee at the crematory informed Pickett that the facility had not only received Miko and Ziggy but had also taken in another dog from Sit just a week earlier. Additionally, the employee shared that a separate pet cremation business had been contacted by Sit, who had dropped off two more dogs there. This brought the total to five confirmed deaths, with more likely to be discovered.

How the Truth Unfolded

As the number of deceased dogs mounted, Pickett’s investigation expanded. The evidence pointed to a systematic approach: Sit had been placing animals in cramped crates in the back of a hot van, where they perished from heatstroke. The van’s interior, described as a “cesspool of bleach and feces,” became a central piece of the case. Prosecutors from the Orange County District Attorney’s Office argued that Sit had not only neglected the dogs but had also lied about their deaths to secure cremation services under the pretense of being their owner.

The trial brief, submitted by the district attorney’s office, detailed Sit’s interactions with Kostyukevich. The owner had initially been reassured by Sit’s professional demeanor and positive reviews. But his concern grew when Sit abruptly ended the conversation, refusing to explain Miko’s death. This prompted Kostyukevich to contact the police, setting off a chain of events that would expose the extent of the cruelty.

A Legacy of Five-Star Reviews

Despite the evidence of neglect, Sit’s reputation had been built on glowing testimonials. Over six years of operation, Happy K9 Academy had amassed more than 40 five-star Google reviews. These included comments like “couldn’t be happier,” “truly cares for the dogs he trains,” and “He never disappoints.” The contrast between these accolades and the subsequent deaths highlighted the deceptive nature of the trainer’s business.

The original owner of Miko, Kostyukevich, had been among those who praised Sit’s methods. He had shared training videos of the dogs, their movements synchronized and their expressions seemingly joyful. But these videos, now available on YouTube, served as a haunting reminder of the lives lost. The animals, once full of energy and affection, had been reduced to silent victims of a system designed to prioritize profit over welfare.

The Final Verdict

Last week, Sit and Liu were found guilty on multiple counts of felony animal cruelty. The evidence presented during the trial included testimony from Pickett, who described the van’s conditions and the couple’s deception. Sit’s claim that the dogs had died in their sleep was met with skepticism, as the lack of struggle and pain mentioned in the text message seemed too convenient. The court documents outlined how Sit had strategically framed the deaths to avoid scrutiny, keeping the ashes of Miko and others safe for families to retrieve.

While the legal system has delivered justice, the families of the dogs remain in mourning. The loss of their beloved companions, coupled with the knowledge of how they died, has left a lasting emotional scar. The investigation into Happy K9 Academy not only exposed the couple’s actions but also raised questions about the oversight in pet training services. For Kostyukevich, the text message from Sit had been a devastating revelation, one that underscored the fragility of trust in the pet care industry.

As the couple prepares for sentencing, the case serves as a cautionary tale. The small crates, the crematories, and the carefully crafted text message were the threads that unraveled a web of cruelty. The dogs, who had once been cheerful and obedient, now stand as symbols of neglect and the hidden dangers of unregulated pet training. Their stories, preserved in the training videos and the testimony of the officers, will continue to echo through the community, reminding everyone of the importance of vigilance in the care of our animals.