NaturVet Digestive Enzymes Plus Prebiotics & Probiotics Soft Chews for Dogs. NaturVet® Digestive Enzymes Dog Soft Chews are for use in dogs over the age of 6 weeks. Helps support diet change and a healthy digestive tract. Contains enzymes and factors for proper digestion and absorption of essential nutrients. Contains a source of live (viable) naturally occurring microorganisms. Helps support diet change and a healthy digestive tract Great for food changes, sensitive stomachs, and support a balanced GI tract Wheat Free Available Size: 5.9 oz (168 g) 70 Soft Chews.