Good food for my pitbull dog

[LuesPinazo]

Hi,
French pitbull dog male is too damn skinny looks malnurished and eats high-quality dog food I decided to add true champion dog in his combo and watched him transform totally awesome results.

I'm searching for good food for my pitbull dog, I got too many vitamin supplements, I'm confused which on would be the best for my pitbull dog?

On the other hand, https://buffk-9.com offers good quality vitamin supplements, buffK9 will protect with the Endurance, Heart Protection, Blood Circulation, Oxygen, Nitric Oxide.
I don't have any idea for the buffk9. Do you have any suggestion for my pitbull dog skinny problem and good health?
Regards,
Pinazo