More people called the Ottawa Humane Society about dogs stranded in hot vehicles this summer than any other year.

In 2012, the humane society received 338 calls about dogs in hot vehicles, according to a news release. This summer, there were 398 calls, a jump of about 18 per cent.

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Of the calls received this year, six charges were laid after dogs were rescued.

The humane society said it believes more awareness about the dangers of leaving pets in sweltering vehicles caused the jump in calls.

The latest charge came Aug. 21 when a schnauzer had to be rescued from a car after being locked inside for more than an hour, witnesses told the humane society.