Disclaimer, I do not really know Humphrey's past, this is totally made up.
We all know that humphrey's past life as a pup was not released in the movie alpha and omega but now here it is. This is we're the story begins.

Back when Humphrey was a pup and haven't even met Kate yet he went throw some rough times.
(Humphrey's pov)
Back when I was a pup i never really had friends, weather 你 believe it 或者 not, I was basically a lone 狼 who only had my so called parents. I was nothing like my parents not even the littlest like them, not my looks, definitely not my personality 或者 anything . All...