Antoinette Ferguson is distraught after finding her beloved dog dead in the bathroom.

A woman whose dog was found dead amid blood and brain matter in her bathroom was so traumatised by the discovery she can no longer live in the home.

Antoinette Ferguson has been unable to sleep since she discovered Diezel's bloody body at her Flagstaff, Hamilton, home.

The Yorkshire terrier died of blunt-force trauma to the head, likely at the hands of a human or car, a post-mortem report states.

A month on from the grisly discovery on the afternoon of June 19, Ferguson has moved out of her Millennium Heights house.

READ MORE: Hamilton family believe intruder brutally bashed dog to death [video]

"I couldn't stay there - every time I went into my ensuite ... it was too horrible.

"I couldn't sleep. I had to go and get counselling. Someone inflicted blunt force trauma on my dog in my home and Diezel deserves justice."

Police have been investigating and are appealing for a dog walker in the area at the time to come forward.

CHRISTEL YARDLEY Diezel was a gift from Antoinette Ferguson's mother.

Waikato police Detective Sergeant Philip Elvy said the investigation had been problematic, given the scene was cleaned up before police were notified, leaving little forensic evidence to go on.

"We are progressing the inquiry and want to speak to someone who was in that area between 12 and 2.30pm that might be able to provide us with some clarity around the investigation."

This person was not considered a suspect, Elvy said, but could help in "getting some answers for Diezel's mum".

The person was seen walking a dog along Eclipse Rise, not far from the Ferguson home, on June 19.

It was just after 4.30pm on the Tuesday when Ferguson arrived home.

When Diezel wasn't there to greet her, as he always did, she began searching the house.

First she found teeth and a blood smear at her ranch slider door.

CHRISTEL YARDLEY/STUFF Antoinette Ferguson, left, and Candice Ferguson discovered their dog Diezel brutally mauled by an intruder when Antoinette arrived home.

She ran from room to room, calling. Nothing seemed out of place. No more blood. No footprints.

Ferguson checked the bedroom before stepping into her bathroom to find the 2.9kg terrier in an "absolute mess".

Dog control was notified and Diezel was taken to a veterinarian for an examination.

A post-mortem revealed the terrier suffered extensive skull fractures on both sides and proptosis of the left eye.

Blood was present within the left ear canal and there was extensive internal bleeding through the skull, neck, left side of the face and under the lower jaw. There was moderate bleeding throughout both lungs.

According to the Pet Doctors pathology report, sighted by Stuff, Diezel's claws and footpads were intact and there were no signs of visible bite wounds to suggest a dog attack.

"Unfortunately, it is not possible to conclude what may have caused this trauma and various possibilities, including vehicular trauma and being hit with a blunt object," the veterinary report states.

Ferguson said the lack of answers is frustrating.

"I've been really scared, as I don't know why, I don't know who and I don't know what kind of person would do something like that.

"This is not just a case of a little dog dying - we know 100 per cent it was not an animal.

"We know it was human on dog - the autopsy made that clear, the lab made that clear - and it was definitely not a car."

His death was too rapid to have been hit by a car and made it inside, experts believe.

"It's been a bit frustrating. I felt police thought it was just a dog."

Police had interviewed neighbours and checked CCTV footage in the area.

"These people were in the area at the time - they might have heard something or seen something," Ferguson pleaded.

Ferguson is urging anyone with information to come forward.

"I want justice for Diezel - but most of all there's someone out there who is a very real threat. How will I ever get closure if I don't know why?"

Anyone who can help or who saw the person walking a dog along Eclipse Rise between midday and 2.30pm on June 19 is asked to call Hamilton police on 07 858 6200.