A pet food label is doing two jobs at once: telling you what is inside, and trying to sell you. Learning to separate the two takes about two minutes and saves you from a lot of expensive marketing.
Read the ingredient order
Ingredients are listed by weight, so the first few tell you most of the story. A named protein near the top is a good sign. A long run of fillers and split grains near the top is not. You do not need a chemistry degree, just a healthy skepticism.
Find the AAFCO statement
Somewhere on the bag is a line about whether the food is complete and balanced for a life stage, formulated to AAFCO standards. That sentence is doing more work than any photo of a happy dog on the front. If it is missing, ask why.
Ignore the buzzwords
Premium, gourmet, and natural are largely unregulated and mean very little on their own. Trust the ingredient list and the nutritional statement over the adjectives. And if a label has you stumped, bring the bag into the shop and we will translate it with you.