Contains balanced levels of carbohydrates (28%) and fats (21%) to maximize performance in sporting and working dogs withstanding long periods of sustained activity. Carbohydrates provide energy which is used in the early stages of physical effort, whereas fats are used more gradually Contains balanced levels of carbohydrates (28%) and fats (21%) to maximize performance in sporting and working dogs withstanding long periods of sustained activity. Carbohydrates provide energy which is used in the early stages of physical effort, whereas fats are used more gradually. SPORT PERFORMANCE + This diet helps maintains healthy joints, support a healthy digestive system (highly digestible L.I.P., MOS, psyllium) and help neutralize free radicals thanks to a synergistic combination of antioxidants (vitamin E, lutein, beta-carotene). MUSCLE CONDITION Activity increases the need for oxygen delivery to muscles as well as protein use. Due to a high level of protein (28%), Energy 4300 supports oxygen delivery to muscles and contributes to maintaining muscle mass.