Garner, who has previous convictions for driving and drugs offences, pleaded guilty before his trial to two counts of owning an XL bully without an exemption certificate.
Birrell said: “The defendant has convictions which reveal a history of reckless disregard for the law and for safety.
“At the time of this incident, despite operating a recovery business driving up and down the country, he was disqualified from driving.”
Lloyd Morgan, defending, said: “Sean Garner does express his deepest sympathy to the family of Mr McColl for the loss, and the manner of the loss, of their beloved family member.”
He said Garner was the primary carer for his partner Lauren Lawler, who had been diagnosed with stage three Hodgkin’s lymphoma and, when she was ill, he cared for their children.