Mackay says the dog hasn't had a heavy racing career.
"He hasn't been pounding the streets every second day or anything like that," the trainer said.
“The fact that I haven't been galloping the dog every second day has added to his longevity.”
To date Fernando Grand has gathered 22 wins and 28 placings for $99,125 in prize money from 67 starts.
Mackay, who has had a long career as a greyhound owner, trainer and club official, says last Sunday’s record-equalling run came as no surprise to him.
“The dog had a different aura about him last week,” he explains.
“I also changed his routine around a little bit. Just a bit of an ease-up instead of going harder. Also, a change of environment - just different things that changed his routine.
“So, the record time last week did not surprise me. At the back of my mind I knew he would get close to a record somewhere. He has come back from his latest injuries better than he has ever been and he turns four in a month.”
Mackay says Fernando Grand is the best greyhound he has ever had and a Capalaba Cup would be his greatest highlight, except for one other.
“The past year or so has not only been the most successful part of my training career, but also the most satisfying,” he says.
“When I say satisfying, the fact that I was able to bring that dog through his injuries and when he was so sick.
“To be able to bring him back and be a record holder, to me that is the greatest satisfaction of all.
“That is the highlight for me. And, that is the story of greyhound racing.
“People don't give themselves the credit they deserve, for what they have been able to do and achieve."