The lost dog

I thought about Teddy. My old dog. I started to suspect that my parents were lying. Teddy was a obedient dog. He would've never ran in front of a car. He wouldn't leave our house. I didn't even see him for the "last" time. My parents weren't like that. They would've let me see him and pick me up from school. They knew that I loved him. My parents were definitely suspicious I had to find out the truth. What really is happening?