I've been using a vacuum on my horses for the last 25 years. I refuse to spend the money on a vac marketed for horses, I use a shop vac. When they are heavily shedding, I use a slick & easy block and the shop vac in a combo and suck up the hair as I loosen it, keeps me from getting a ton of hair in my mouth and eyes. Once they aren't shedding by the handful I put a grooming attachment on it and vacuum them. When I was younger I used a dirt devil, the original version that had a very slow speed and the beater bar with brushes - that thing shined up a horse like no other and they LOVED the massage that they got.
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.