LitRPG: Even My Dog Is Invincible

Zhang Xuan got a seemingly unreliable system.
His daily task was to walk the dogs and clean the place.
In the end, he was shocked to find that...
The dishes he planted were at least sacred grade spirit medicines!
The dog he raised was actually a Qilin Demon Saint!
The dishes he cooked, any plate was comparable to a ninth-grade spirit pill!
Zhang Xuan: "No, impossible, you must be mistaken!!"