First the weasel words. Trooper has Insulin dependant Canine Diabetes Mellitus. He's also
14 1/2 years old, mostly blind, a little deaf with a bad thyroid, allergies, no testosterone production and an artificial hip. This is our story, his and mine and I'm doing things the way that seems best to me from my Vet recommendations and what I've learned through research and trial and error. Please educate yourself and seek advice and treatment from a reputable Veterinarian. I am neither a Veterinarian nor a medical professional. My advice is based on my experience. Your mileage may vary.
A word of caution on filling the syringe. You must be certain all air bubbles are out of the syringe. If you get a vein the insulin will still work but if there's a bubble it can kill your dog. My syringes come with a small gap between the plunger and the base of the syringe. I start by depressing the plunger all the way. I insert the needle and do a partial draw. I flick the needle body with a finger nail and watch to make sure all air bubbles rise to the top. I press the plunger and expel the air and insulin completely. I do another draw 1 unit past the dose and then press the plunger again until I get to the correct dosage. Now we're ready. Get trained by your Vet and practice before you do your first injection. When you're ready be confident and sure handed. A word on units. Be sure you go over this with your Vet. It's easy to miss read the unit markings and give too much or too little and either can have catastrophic results.
I have Trooper lie down and get settled I grab a handful of loose flesh and expose the skin underneath. Trooper handles the procedure without complaint. Seriously, he's under absolutely no stress. I wish I was more like him.When we're both ready and I've picked the injection site i make a quick stab at a shallow angle and press the plunger to the stop. In this photo I'm pinching, lifting up and pulling forward. The injection is going in toward the head, below the pinch and into the meaty part of his neck flesh while not into the muscle. I was trained to do subcutaneous but intra-muscular is also acceptable.