My pup Gemyni is 18 weeks old. When I take her out on her own she's terrible on leash and will run digging down deep and yanking Just H3ll On Four legs. She's worst when I take Legend along. I trained Legend and he has no problems on leash except when Gemyni's there. She jumps on him and he wants nothing to do with her on walks. He is allowed to loose leash walk or he'll walk by my side which I don't have a problem with. Gemyni is just all over the place. I absolutely hate walking her but do it anyway. 2 times a day. I know crazy! ...She will be enrolled in OB class after she gets her kennel cough shot. She knows most basic commands EXCEPT how to walk nicely on a leash. I've tried the Gentle Leader she just thrases around acts up. I've tried standing still until she stops pulling every step. I've tried walking turning in the opposite direction fast when she starts pulling. I've tried carrying treats to keep her attention. NOTHING has worked w/ a buckle collar on her. So I was wondering about a Martingale. Should I use this one that's all nylon or te one with the chain for the sound effect. I've never had to use training collars on a dog as young as her. So I don't know whats okay to use on her. Any advice is welcome!