Fido-Belly Bones Treats Bag: Large. PreBiotic stimulates the growth of healthy bacteria known as ProBiotics. Probiotics help maintain the natural balance of microflora in the gastro-instestinal tract for healthy digestion. Corn and wheat free. Made with kelp, parsley and yogurt powder. This package contains 8oz of large belly bones treats. Recommended for dogs over 6 months of age and 5 pounds. Made in USA.