Absolutely TERRIBLE product! I should have read the reviews before purchasing this. Not only did the package not come with everything in the description (it was missing the test tube to put your blood sample in) the needle they provided fell apart multiple times WHILE TRYING TO DRAW THE BLOOD. My poor dog had to go through multiple pokes before I finally threw it in the trash and used my own. Luckily I had them on hand! The instructions were also horrible as to how to use the blood. Typically you spin the sample down to get serum but it said use whole blood. The test came back negative but I'm almost POSITIVE she's pregnant. I wouldn't use this product again to save my life! Do yourself a favor a buy something that actually works and has clear instructions with EVERYTHING its supposed to come with.