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Check the vaccines to make sure they've been properly transported and stored at the temperature on the label. You may need to mix vaccines. If so, there will be two vials that you'll need to combine according to the label instructions. Once mixed, draw back all of the solution into the syringe and remove excess air bubbles by tapping on the side of the syringe. The needle should be pointing up. Most vaccines will need to be stored at normal refrigeration temperatures. Make sure the dog is clean so that no dirt is visible around the loose skin on the neck. His fur should be dry before you vaccinate. Lift up the back of the dog's skin near the neck to make a tent. This gives you a pocket of space underneath the skin where you can inject the vaccine. Unlike humans, you don't need to prepare the site with an alcohol wipe. Hold the syringe level with the dog's back and place the needle with the bevel (flat part of the needle) along the tented skin. Gently puncture the skin with the needle and draw back on the syringe. Slowly press on the syringe plunger to give the vaccine. If you see blood in the needle, you will need to find another location to give the injection. Blood in the needle means you've hit a blood vessel and you cannot give a vaccine into a blood vessel. Once you've taken out the needle, apply pressure on the site for about 30 seconds. This will prevent bleeding. Place the needle and syringe in an appropriate garbage receptacle or in a glass jar to be disposed of at a veterinary clinic. Never put an uncapped needle into the garbage since people who work at landfills could get injured.
Prepare the injection. Prepare the dog. Insert the syringe. Remove the needle.