He was no different from a dog in the beginning. It is very obvious why he grew to be so attached to Qian.
Honestly. I can't imagine what he must have been through. Getting kidnapped, sold, maltreated by the family that bought him, escaping and living on the streets in fear and hunger, fighting for food with dogs and the likes. What would our baby have done if he did not end up in that alley close to Qian's house? π
https://wuxiaworld.eu/novel/sha-po-lang