A drug-crazed thief was Tasered after he threatened to hack off a police dog's head with garden shears, in an incident captured on CCTV.Jamie Swann, 28, was filmed jumping the fence of terrified neighbour Jane Green, 59, and then attacking her car with the bladed tool in the middle of the night.The maniac then wildly waved the 2ft long garden implement around his head and violently smashing up the Ford B-Max, before police shot him.On Tuesday Swann was jailed at Nottingham Crown Court after pleading guilty to criminal damage and using threatening words to cause alarm or distress.He was imprisoned for 22-months, four-months for the incident and a further 18-months for breaching a suspended sentence for theft, burglary and theft of a motor vehicle