VIDEO | 3 tips for keeping your dog cool
The police service said it has responded to four separate reports of dogs locked in cars in parking lots, while the temperature has been over 30 C.
In one instance, in a Walmart parking lot in Vaughan, the pet owner was charged for leaving the dog in their vehicle.
The Ontario SPCA said animals can die from excessive heat. Temperatures above 30 C can feel like 70 C to a dog in a car, the animal welfare organization said.
It has recently started an online campaign against leaving unattended pets in hot cars, called #nohotpets.