A police dog was stabbed four times when armed officers were despatched to a disturbance and arrested a “dangerous individual”.
PD Axle was injured while assisting police at 18:50 BST on High Street in Riddings, Derbyshire, on Wednesday.
Derbyshire Police said he was receiving treatment and it had “fingers and paws crossed” for Axle, and thoughts were with his handler.
A 27-year-old man was arrested during the operation.
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After the attack, Derbyshire Armed Response Unit said PD Axle had been “sedated” and was “awaiting surgery” at a veterinary practice in Derby.
The force said it detained a “dangerous individual” with the help of the National Police Air Service (NPAS) Birmingham.
It tweeted: “Wishing a speedy recovery to PD Axle who was injured during the arrest.”
Officers said they were called to a “domestic incident” after reports of a disturbance.
“The incident resulted in a large number of officers, including the police helicopter, attending the scene,” it said.
“No officers were physically hurt during the incident; however, a police dog was injured and is receiving treatment.”
NPAS Birmingham tweeted: “Just assisted @DerbysPolice with a violent suspect search in #Alfreton.”