He had soon started fearing for his life after the accident which happened at around 10.30pm at night.
The 64-year-old had ventured out to collect firewood – without a coat or proper footwear in temperatures of -4°C – and his nearest neighbour lives a quarter of a mile away.
Bob tried screaming for help – and while no human responded – he later explained: “But my Kelsey came.”
Indeed his pet provided enough warmth to get the pair through the night and most of the following day.
Bob – who can remember he lost consciousness for a short time – was eventually discovered by his neighbour at around 6:30pm the following evening.
He was rushed to hospital by his daughter Jenny where doctors discovered he had broken his neck and was paralysed in his legs – as well as suffering from hyperthermia.
Bob, who asked for his surname not to be printed, has since regained some movement after surgery – but will need to undergo rehabilitation too.
Dr Chaim Colen, a neurosurgeon at McLaren Northern Michigan Emergency Department who treated Bob, said his recovery was miraculous.
Bob is in no doubt he has “man’s best friend” to thank for being alive.
Petoskeynews reports that Bob said later: “By morning my voice was gone and I couldn’t yell for help but Kelsey didn’t stop barking.
“Kelsey kept me warm, alert and never stopped barking for help.
“Dr Colen saved my life and ability to move. They are truly heroes and I will be eternally grateful.”
He counts himself lucky too his injuries were not worst.
“I was surprised to find out that I didn’t have any frost bite,” said Bob.
“I am sure it was because of Kelsey’s determination to keep me warm and safe.”
Dr Colen is in no doubt why his patient is alive either.
He said: “I think animals can help and his dog really kept him alive and really helped him, he was very fortunate.”
Bob and Kelsey have since been reunited in hospital.
Jenny said: “He was right out of surgery and she licked his face, and they were crying and it was beautiful.
“It was everything that you would think the reunion would be.”
Kelsey is however pining after her master at home.
Jenny added: “It’s so emotional thinking about her and you could tell she was bringing everything she had of his to lie on.
“She’s the sweetest dog and we all say how smart she is.”