Man’s best friend bid farewell to his bedridden owner, who is expected to succumb to cancer in the coming days.

Last week doctors told Mike Petrosino that they used all the arrows in their quiver for the battle the young man has waged against cancer since April 2004, two months before his 14th birthday. He was then an eighth grader.

“Seeing Rusty come visit was one of the few things that has been able to make his brother John smile,” one friend said.

That friend posted a picture of the tearful goodbye on Reddit under the username 7thEvan. He explained that Petrosino was given a 3% survival rate the first year of his diagnosis but managed to beat the odds — at least, for a while.

“Two days ago we found out that after 8 years, the amputation of his leg, and four rounds of cancer that there’s now nothing that they can do,” the friend said Friday.

The primary tumor was in his right pelvic bone. It spread to his lungs, shin bones, collarbone and two ribs, his mother Paula Petrosino explained.

The teen started aggressive treatment for the rare metastatic Ewing’s Sarcoma.

“Every 21 days he was admitted to the hospital for chemo,” she said. “Treatment would last from 3 to 5 days. He also had over 100 radiation treatments to different parts of his body.”

After a year, the young man appeared to be cancer free and started to attend school again. But in April of his senior year, the pain returned.

Tests showed that he had a new cancer: radiation induced Osteo Sarcoma. He was back in the hospital for 10 days every three weeks and started surgery after graduation.

Once more, family and friends thought Petrosino beat the odds until 2012 when doctors discovered he had another new cancer called radiation induced Rhabdomyo sarcoma, his mother said.

Surgeons amputated his right leg.

Right now, Paula Petrosino is raising money through GoFundMe to help with medical expenses.

“He is the strongest person I know and he is my hero,” his mother said.

Read more: Daily News