I have the pickiest little guy EVER...we tried about 7 or 8 foods before we found one that Hobbs liked. The grand prize winner was CHICKEN SOUP! We just leave it out all day and free feed. We have noticed that he usually waits until late at night to eat. I guess he is holding out for treats or table scraps and when he realizes he isn't getting anymore he'll go eat his food
Hobbs does need to gain some weight so I think I'm going to start putting plain yogurt on his food in the AM and cottage cheese on his food in the PM and leave just plain dry food for him out the rest of the day. But he really does love the Chicken Soup. It is the only thing that he'll touch.
I have never tried Merricks, but a lot of people on here say their yorkies love it!