[Tina]

Look for the AAFCO label on the back of the bag or on the brand website. Some say…

Adult
______________________Dog Food is formulated to meet the nutritional levels established by the AAFCO Dog Food Nutrient Profiles for maintenance

All-Life-Stages
_______________________ Dog Food is formulated to meet the nutritional levels established by the AAFCO Dog Food Nutrient Profiles for all life stages.

Puppy
________________________Dog Food is formulated to meet the nutritional levels established by the Association of American Feed Control Officials (AAFCO) Dog Food Nutrient Profiles for growth and gestation/lactation.

Senior
_________________________Dog Food is formulated to meet the nutritional levels established by the Association of American Feed Control Officials (AAFCO) Dog Food Nutrient Profiles for adult maintenance.

There really isn’t a difference between adult and senior but there is a difference between puppy, all-life-stages and adult. Hope this helps!