What caused it

On a warm summer day, Timmy turner was walking peacefully down a street. As he was rounding the corner with his popsicle stick in his hand he heard some barking. He always loved puppies so he starting following the sound of the dog and eventually found it. As he got closer to the dog it starting barking more and more and more. It got to the point where Timmy was about 10 feet away from the dog leaning over the fence.The dog finally got up starting tugging on his chain and broke it. Timmy saw the dog jump over the fence and start to charge. Timmy said to himself out loud, STOP, please somebody help me, but it was to late. The dog had already eyed up the popsicle and took a huge bite for it. The dog didn't get only the popsicle, he got Timmy's finger too. What timmy didn’t see was the BEWARE dog sign on the fence where his body was covering it.