We all take chances. I try to find meds that are made by a reputable manufacturer. I.E. If it says its made by cipla,
I look up "cipla", and find it is a reputable manufacturer.
If you are concerned, I'd take the pet meds as I do.
Those canandian pharmacies are listed as rogue. I can tell you I received questionable meds from them and my husband got cialis and its reaction was not the same as the normal cialis. They will send you constant spam (as i receive) and call you if you give them your number!
It is all up to you. Can any of us say exatly for sure on overseas stuff? We can only go by research, what others have experienced, etc.