Remove the product tubes from the package and separate one tube from the other. Hold the vial with the notched tip up and away from the face. Use scissors to snip off the tip at the notches. Invert the vial and use the open tip of the tube to part your pet's hair between the shoulder blades. Squeeze the tube to apply all of the product to your pet's skin in a single spot between the shoulder blades. Allow the treated area to dry thoroughly.