(CNN/KTVT) -- A 15-year-old girl is heartbroken after someone reportedly shot and killed her service dog outside her Texas home. 

The golden retriever named Journey was specially trained to detect when Hannah Westmoreland's blood sugar was low.

For nearly four years, Journey has been right by Hannah's side ready to alert her.

"He was my best friend," Hannah said.

On Sunday morning, Journey was let out for his daily quick dip in the pond outside his family's rural home in Quinlan. That's when someone apparently shot the service dog.

Journey died despite efforts by a veterinary clinic to save him.

Hannah's mother, Tina Westmoreland, said their entire family is distraught as her daughter gets ready to reach new milestones that Journey won't be there to witness.

"She's about to get her drivers license and he was going to protect her," said Westmoreland. "He was going to be with her while she was in college to keep her healthy."

The town of Quinlan has raised $10,000 to get a new service dog for Hannah.

No arrests have been made as the Hunt County Sheriff's Department continues its investigation.

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