Margo Bird, the executive director of the The Fredericton, New Brunswick, Society for the Prevention of Cruelty to Animals said Tiny was dropped off in a box at the facility Dec. 30, CBC News reported.
She said staff members thought the box contained a donation of office supplies or pet food.
"Lo and behold, there was our 30-pound wonder. Tiny and another normal-size cat, Rapunzel, he was tucked underneath Tiny. So, I think, they were happy to get out of the box, to say the least," Bird said.
Now Bird said the shelter is now trying to get Tiny's weight under control, as obesity is a risk factor for feline diabetes, breathing problems and arthritis. However, staff members have yet to find something he's willing to eat.
"At the moment he is not eating, so we are desperately trying to find a food that Tiny will eat, because when a feline does not eat that has life threatening repercussions as well," Bird said.
Tiny moved to a foster home on Thursday and his diet is being monitored by a local veterinarian, free of charge, Bird said.