The Nassau County Society for the Prevention of Cruelty to Animals is offering a $5,000 reward for information leading to the arrest of whoever abandoned a dog in Plainview last week, officials announced Monday.

The Yorkie mix has been named Steve by the staff of the Oyster Bay Animal Shelter, where he has been kept since a jogger found him in an animal carrier bag on Feb. 7 on Washington Avenue, town and shelter officials said.

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“It’s a very serious issue when somebody leaves a poor little dog like this confined in a bag like that,” said Gary Rogers, spokesman for the Nassau County SPCA, said at a news conference at the animal shelter. “There’s no way he could have got out. If it wasn’t for these two joggers that heard him barking and went and found him, and called the police department, with the storm that came by, he would have died.”

Rogers said the dog had been left in a wooded area deliberately, about 5 feet from the street, either by someone who abandoned the dog or who had stolen it and left it. Animal abandonment is a misdemeanor punishable by up to 1 year in jail, Rogers said.

Oyster Bay Town Supervisor Joseph Saladino, in his first news conference since being appointed two weeks ago to replace former Supervisor John Venditto, said Steve was healthy and well-groomed.

“It’s very important to find out who the owner is because we want to know just what happened,” Saladino said. “Was Steve lost? Was Steve stolen? Or was Steve abandoned? If Steve was abandoned, we need to bring the people who abandoned him to justice.”

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Saladino said officials are looking for tips from the public to find the owners. If no one claims the dog within six days, he will be put for adoption, Saladino said.