SHERMAN OAKS ( — A Sherman Oaks man battling cancer is asking for the public’s help in finding his missing dog.

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Gordon Carnie said Cooper, his 6-year-old Australian shepherd, ran from his arms in September while they walked to the veterinarian on Ventura Boulevard.

“He just bolted and got himself out of his collar,” he said. “I chased him for about half a block, but he’s so fast.”

Carnie, who has been in a 4-year fight against pancreatic cancer, said Cooper and his two other dogs have helped ease the pain on the days he couldn’t get out of bed.

“They’ll jump on the bed. Be next to me. Stay there as long as I wanted them there,” he said.

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Cooper, especially, has been there for Carnie throughout his health crisis, which included surgery, radiation and chemotherapy treatments.

“It’s been a tough road, to be honest with you,” Carnie said. “The diagnosis is not usually very good. There are only six percent of the people that live past five years. I believe I’ll easily surpass that now.”

Carnie posted a $1,000 reward for Cooper’s return all over Sherman Oaks.

A woman apparently spotted the dog limping 15 miles from Carnie’s home.

After a chemotherapy appointment, Carnie said he searched all night, but Cooper was gone.

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“I haven’t stopped thinking about him,” he said.