Hi Quanzhan!
I do remember Zack. How could we forget such wonderful rescue story! It's great to see him looking so well and knowing he's having such a terrific time with you and your family.
Sorry about the allergies. That's a problem I know well because Natasha, my first Golden, was also allergic to just about everything Fortunately, there are treatments for that and you are doing the right thing, as always, to make him comfortable.
Please give him a big hug from me.
Alicia