COLLINSVILLE, Oklahoma - Officers are investigating an animal cruelty case.

Collinsville Police said two men left a dead puppy on city property.  They said as a man was walking by the city lake, which is located in Rogers County, when he spotted a suitcase in the woods.  Inside was a dead puppy.

The Cocker spaniel mix found inside was already dead before going in the suitcase.

Police said an autopsy by a veterinarian shows the dog had parasites. 

"It's just heartbreaking," said Paco Paw’s Rescue Owner Susie McConaghie.

McConaghie said she could have helped out had she known about the sick puppy. She works with the city's shelter and with the Ward Wiseman Animal Haven.

"It's one of the best things I’ve ever done in my life and it's also one of the worst. The things that you see are unimaginable. But the things, the lives that you save, how can you beat that," said McConaghie. 

Police said the puppy belonged to a woman who let it suffer for four or five days. 

She has not been arrested, but officers said she could face an animal cruelty charge for not seeking help.

Officers said she asked two men to bury the dog for her, but instead, they put the dead animal in a suitcase and left it on city property, which is illegal.   Those men have not been arrested but could face charges.

"I know sometimes people are embarrassed to ask for help. Don't be," said McConaghie.

McConaghie, who has her own rescue dog named Maggie, encourages anyone who comes across an animal in need to reach out so something like this doesn't happen again.

"We're always gonna help. Always, we're never gonna turn anyone away," she said. 

The Rogers County District Attorney will determine whether or not charges will be filed.