All the while the family's other dog, Fanta, was barking in the bedroom doorway. Eventually Mr Sheehan got up and went in search of liniment. When he couldn't find any, another thought occurred to him.
"My brother had died of a heart attack in bed about 12 months ago," he said. "So on the way past I picked up the phone and called the medical centre."
Mr Sheehan was ordered to waste no time in getting to the doctor, and following an examination was sent straight through to Christchurch Hospital. There he underwent surgery to have stents implanted in his heart to keep the arteries open and restore the blood flow.
"They say dogs can sense these things, now I believe it," Mr Sheehan said.
It will be a month or so before he is back on the golf course, leaving plenty of time to spend with Cola, who was still keeping a protective eye on his master when the Guardian visited this week.