When I took over my Border Collie bitch from animal welfare, she had some dietary issues: tartar, bad breath, it smelled extremely of dog, despite shower, the dying fur was reddish. Then I tried different foods and have landed at Josera Optiness. They tolerate well, and the problems are gone. For me an important point: the output. From the cheap brands heap and bloating were not very socially acceptable. ;-) With Optiness the feces is compact.
I have also tested the expensive foods, but Optiness I liked best. And the bitch it also eats like.