BOSTON (CBS) – The public is being asked to help track down a pit bull that was stolen from the Animal Rescue League of Boston.

Shelter employees say a 55-year-old man and a woman came in on Sunday around 3 p.m. and expressed interest in adopting a white and gray pit bull-type dog named Nick. The pair took the dog for a walk and never returned.

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“We want to see him back here safe, we miss him,” said Carolyn Curran of the Animal Rescue League. “We want to find give him a good home, we just want him back here safe.”

Nick the pit bull. (Image Credit: ARL Boston)

The man left his Massachusetts ID with the Animal Rescue staff before leaving with the dog. Boston Police and Boston Animal Control have been contacted about the theft.

There are security cameras all over the Animal Rescue League of Boston, which caught the man as he walked in with a woman at around 3:00 p.m. Sunday, saying he was ready to adopt a pet.

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“His adoption fee would have been $350 dollars,” Curran said.

The address on his ID turned out to be inaccurate and with each passing day, those who had gotten to know and love Nick at the shelter are worried about him.

A man suspected of taking a pit bull from Animal Rescue League of Boston. (Image Credit: ARL Boston)

“We want to think the intentions were kind,” Curran said. “It’s hard to speculate on all the different things that could happen.”

The suspect is described as 5’9” tall with dark complexion. He was last seen wearing black pants, a blue hoodie, a tan jacket, Red Sox hat and glasses.

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Anyone who spots Nick or the suspect is asked to call 911 immediately and not approach them. The shelter says its goal is to have the dog returned safely.