I have a question for anyone who has had an IV at a ride, or had started an IV or did blood work on horses at a ride, or anywhere for that matter. How come they always do it on the horse's Left side of their neck? Is there not an equal vein of the opposite side? Are they bilateral or unilateral? Is this just a coincidence, or maybe its easier if you are right handed, so that's why they do it? What if the vein gets poked many times, like sometimes racehorses do, and it gets sore or sclerosed, or infected? Are there other veins that can be used for treatment besides the neck? just curious, Thanks Beth