hold the pup on its back head away from you in one hand, hold the tip of its tail with the other hand and pull the tail gently inbetwean its back legs so its liying over were its balls or flu are going to be, the tail wants to come of at the belly side of genitels, this way the tail will be bang on, do it afew times to be sure, nowt looks worse than a wrong dock, mine all get done this way i never had a under or over dock, its the [bANNED TEXT] way,