The Sarnia Police Services criminal investigations division is working with the Ontario Society for the Prevention of Cruelty to Animals (OSPCA) in a joint investigation.
A passerby found the cat, named "Joe" by officials, with 17 pellets lodged in his head on a roadside Feb. 2 in the bedroom community of Brights Grove.
The cat was brought to the Sarnia and District Humane Society. Despite losing an eye, the cat is in stable condition.
"We are hopeful he will have a successful recovery with minimal long term damage," the humane society said on its Facebook page.
Anyone with information is asked to call police, the humane society or Crime Stoppers.
A cash reward over and above what Crime Stoppers typically offers is being offered by members of the public.