I have VPI on Min Pin Lily. When I starting buying it for her my children thought I was crazy. Well for me it worked out Great. Lily,was at my daughters one day and ate a LARGER amount of fox-tails and had to have surgery. Without VPI I would have two choices 1)to put her down 2)have a large bill on my credit card. Lily had the surgery they found some many fox-tails that it filled a sandwich baggie about 1" across the bottom.