This is a jukugo word that uses the on'yomi readings of the kanji. You haven't learned this reading for 度 yet, so here's a mnemonic to help you remember them together:

In preparation for getting sheared, a sheep will sit on a tack (したく). This sheep tacking makes it so that the shearing part is nothing! Imagine watching some sheep getting ready by sitting on tacks. Yikes. You want to tell them being sheared doesn't hurt and that sheep tacking is worse, but something makes you think they won't listen to you.