Most tail extensions come with instructions & some refer you to a YouTube video. Google tail extensions & look at their websites for color selections, weight and other details. That is how I picked mine, results were excellent. I picked an extension from Tails By Kathy. Posted via Mobile Device
If your horses tail is already thick, don't get anything over one pound. You could go for a half pound as well. If youd like the tail to look thicker you would choose anywhere from one to two pounds.. But make sure if you get the two pound tail, it doesnt look so obvious. The more hair you get, the more obvious it will be and you would be counted against that at shows.! Good luck:)
Oh also, you want to match the thickness of his tail. So if his tail is thin, you could get a one pound so it adds fullness but doesnt look fake. If anyone wants to correct me please do! I've been looking to get one for my dapple grey because the babies chewed it off before I got him! Also his tail is black grey and white so itd be so hard to match it exactly.