Buyers and pet lovers beware! This company illegally labels their prescriptions with drug companies names, and yesterday I contacted the drug company directly who says they do NOT do business with Drs Foster and Smith. What you are buying from Drs Foster and Smith is 'grey' market products, manufactured by companies whose names they will not reveal, where they are located, they could just be expired, stored improperly, or made to look like the real thing. I strongly recommend to talk to your vet about companies such as these who offer NO guarantee for their products, they cannot as they are not legally from who they say they are on labels.