I decided to go with the injectable dewormer this year - I used the recommended 16 gauge 3/4 inch needle subcutaneous - I'm pretty sure all the dewormer leaked out of the injection sites within 5 minutes. I used two injection sites for each cow because I was giving over 10 cc per animal, didn't matter. Leaked out. Tried a 20 gauge needle on the second cow, couldn't push the dewormer thru it. I would really like to figure this out before I deworm the yearlings. I don't remember having this problem with the no name brand I used a few years ago. Besides trying an 18 gauge, anybody got any tips?