Dog food recommendations for shih tzu?

I recently had to change Stella's food and am now feeding her Taste of the Wild lamb. She seems to really like it. I free feed her and she eats whenever she wants. Some days she eats a whole bowl full and some days she doesn't eat at all. She's been like that since she was a small pup and she's at a healthy weight. I don't worry about it. Some days I eat more than others too, I think it's natural.

My Maltese eats Fromm grain free dry food. I change up the flavor each time I buy a new bag. 

Remy the killer Shih Tzu is about 5.5 now and he's never been a big eater. We've changed his food a few times over the years and now he's on the Blue Buffalo. Kinda pricy, but he eats like a bird. We leave food out all the time, he's not a run to eat when you put it down dog. We were surprised, but there are some days when he won't eat any food.

We have a medium sized dog and use the food that the breeder recommended. His coat is so smooth it's amazing. I think it's because of the food. I did some research and compared various dog foods. It's surprising how much crap regular name brand dog foods put in their kibble.

Here is a useful link to researching dog food: Dog Food Advisor

Our Shittypoo, as dh calls her, eats Taste of the Wild. I buy it in the 50 lb bags from Amazon and they last 3-4 months. I switch the flavor each time. We free feed her. I'd say she eats a third of a cup daily. She also only drinks filtered water and has a lively coat and no staining around her eyes.

Do you have a local pet food store? Establish a relationship with them and discuss the issue. Most places will give you samples to see what the dog likes.

Our pooch used to be a voracious eater. I am not sure she ever tasted anything. We have been giving her the Fromm line of dry food for a lot of years, buying a different flavor for her each time we bought a new bag. About six months ago, she became very reluctant to eat. There were no physical issues, everything checked out fine at the vet. Her groomer, who also owns a natural pet food store, suggested switching her to the senior formula of Fromms since she is now 13 years old. She thought the regular formulas may be upsetting our dog's stomach.

That helped but what I think really made the difference is we started mixing about a tablespoon of can dog food, pureed veg or fruits into her food along with some water. She is back to enjoying her food. I think she just got tired of the same thing all the time. We mostly buy the Merrick can food which comes in a lot of different varieties and I can tell when she likes one more than another.

I would try mixing in a small amount of a quality can dog food and see if that increases her appetite.