Problems with collaring/leashing pup. Has to pin the pup into a corner to collar and/or leash the pup (info from a different thread that was posted by same person). It’s the thread where the 3yr old GSD bit the 70yr old guys arm.
My advice, never corner a dog and force anything on them! Your best bet is to lure them to you with treats, food, or favorite toy. If the pup still won’t approach that way, I would sit in on the floor with my back facing the pup, with collar and leash in my hand, and wait for the pup to approach me. Give them a good girl/boy and a treat. Do this over and over for a few days without actually leashing the pup. The theory is, they will learn the leash brings treats and praise.
Pup is 3 months old (15 weeks), so it’s odd to me that the pup won’t allow a collar or leash. How old was he when you got him/her? Where did you get the pup from (Breeder, rescue, pound)?