A 33-year-old man was arrested in connection with the incident at a property in Galston, Ayrshire, on Saturday morning.
Officers are trying to find out who the man is.
What was left of the dog's body was found in a pile of ashes along with its collar and lead.
A royal expert has shared that Prince Harry isn't likely to feature in William's royal plans 'at all'.
Officers were alerted to the incident on Cross Street, Galston, just after 8am on Saturday.
It is the sixth-largest cocaine haul found since records began.