A 51-year-old man was taken to hospital following a “disturbance” in Eric Hendrie Park on Sunday at about 8.30pm.
Officers were called to a report of a vehicle in the park and a disturbance taking place which resulted in the death of the victim’s XL bully dog.
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The owner of the dog was taken to Aberdeen Royal Infirmary, where medical staff said his condition was serious but stable.
A spokesperson for Police Scotland said: “Inquiries are ongoing in the area to trace everyone involved.”
The force said that the victim was not struck by a car.
Detective Sergeant Emma Low said: “Our investigation is at an early stage to establish the exact circumstances surrounding this incident.”
Any witnesses or anyone with information is being asked to contact officers through 101.