Recommended for puppies of breeds with adult weights up to 20 pounds from weaning until 12 months of age; pregnant and nursing dogs. Now with Natural Prebiotic Fructooligosaccharides (FOS) to support your dog's strong defenses. Eukanuba Small Breed Puppy Formula supports the healthy development of small breed puppies. Small puppies need food that supports their amazing energy requirements, because they reach maturity in just 9 to 12 months. These puppies burn more calories and need more energy per pound than larger breed puppies. Eukanuba Small Breed Puppy Formula is designed to meet the increased needs of growing small breed puppies. Natural Prebiotic Fructooligosaccharides (FOS) in Eukanuba has been clinically proven to support strong defenses.