Very good kibble.
My 13-year-old Jack Russell Terrier has been fed this food since I adopted her 6 years ago (sometimes switching to the grain-free lamb version from the same brand). Her previous owners used to feed her supermarket-brand kibble with questionable ingredients and lots of cereals. I noticed the difference straight away—her coat looked much better, she had more energy, and so on. I recently had to get her blood tested and she has no deficiencies; everything is spot on.