Responses
That’d make sense given that fluffy is also (in the nicest words) dumb, it’s obvious that he doesn’t know anything
The Beast Virus humanised Mr A's dog perhaps?? Or he was just too young when the Beast Virus hit him so he succumb more into his animalistic instinct?
What if fluffy was an animal who turned into "human" that's why we see Mister. A patting his head when fluffy was a DOG in the flashback.