^+1. First be careful where you post this lest the SPCA or PETA come after you for dog abuse
I do not see any unusual grain in what I downloaded. But what is the source material. How was it shot, processed and played prior to capture?
FWIW: the scene could be low light, and many camcorders added a lot of gain to form imges which could result in sensor pixel thermal noise/slightly different dark currents becoming visible as a grain, often a fixed grain pattern.