This video was taken last week in British Columbia.
The woman who posted it online explained the background, saying,
"My husband was leaving the pool and heard a really loud and continuous car horn coming from the parking lot. At first he though there was a person sitting in the front seat of the car leaning on the horn, but as he got closer he realized it was a dog. He started filming and as he got closer he could see the dog's paw pushing on the horn. He stopped filming and tried to distract the dog to get him to take his paw off the horn, which the dog eventually did."