Paying fifteen cents for a can of dog in 1964 would be the equivalent of paying around $1.27 for a can of dog food in the year 2021.
The $500.00 to be paid for winning the dog food contest would be worth about $4,242.00 in the year 2021.
According to Inflation Calculator, the 15 cent dog food would cost $1.27 in 2021 dollars.