I’m no scientist. But the way I understand it, a year is defined as the length of time it takes one’s planet (that would be Earth, in our case) to orbit its star (the Sun).
Earth kindly demonstrating its orbit.
Now, I’m not much of a dog person either. But I’m pretty certain that every dog I’ve encountered so far has been on the same planet as me. So what’s all this nonsense about “dog years”? Just stop it.