[1] Prior to 1997, Harrison worked for Graham Calvert before joining the North View Kennels of Paul Rutherford, who was contracted to Newcastle Stadium (known as Brough Park at the time).
[2] Harrison then worked as Assistant Trainer to Jimmy Wright and was part of the team that won a number of major races and trained stars such as Droopys Buick, the 2016 Greyhound of the Year.
[3] In 2017, Harrison took over the trainers licence and Newcastle Stadium contract from Jimmy Wright and the pair run Alnwick greyhounds which is based at Greensfield Moor Farm in Northumberland.
[4] Since 2017, the kennel has won numerous events with the stand out performers being Droopys Verve who finished runner-up in the 2018 English Greyhound Derby[5] and Droopys Expert who reached the 2019 English Greyhound Derby final.
[6] The kennels most significant moment came on 6 April 2019, when Harrison secured the 2019 Trainers Championship at Sheffield.