This is the moment a hero police dog brings down a knifeman accused of stabbing his girlfriend.

Suspect Bobby Dean Martin, 38, is said to have cut and tried to strangle his partner at their home in Indian River County, Florida state, USA, on 11th July.

Police said Martin fled on foot after a taser had no effect on him.

But police dog Mako – named after the deadly shark breed – brought Martin to the ground who then tried to strangle the dog.

According to the police, he also hit the arresting officers several times and “physically fought with the booking deputies” at the police station.

He is currently being held without bail on several charges, including battery – domestic violence by strangulation, aggravated battery, battery on a police dog, three counts of battery on an officer, and resisting arrest with violence.

Indian River County Sheriff’s Office (IRCSO) said in a statement on 12th July: “The search for a domestic violence stabbing and strangulation suspect ended with the assistance of K-9 Mako and his partner K-9 Handler Dep. Ricardo Ferrer.

“On Monday night, Deputies responded to the 4200 block of 48th Avenue in reference to a domestic disturbance where the victim reported that her live-in boyfriend attempted to strangle her.

“Upon the deputy’s arrival, it was discovered that the victim had also been stabbed by the suspect.

“K-9 Mako and his partner K-9 Handler Dep. Ricardo Ferrer helped bring to an end the search for the suspect, identified as 38-year-old Bobby Dean Martin.

“Deputies searched the area and upon locating Martin, he refused multiple commands and attempted to flee. Our deputy deployed a taser, which had no effect on Martin.

“As Martin continued to flee, K-9 Mako immediately tracked him and was able to successfully locate Martin. At that point, Martin began actively resisting and tried to strangle K-9 Mako.”

The police stated: “Deputies were eventually able to subdue Martin and take him into custody, but only after Martin kicked and hit our deputies multiple times.

“He continued to fight at the hospital, where he was medically cleared for release to the jail.

“At the jail, he also physically fought with the booking deputies.”

They added: “Martin faces numerous charges including felony battery – domestic violence by strangulation, aggravated battery, battery on a police dog, three counts of battery on an officer, and resisting arrest with violence.”