As I have Sapphire and Turbo and I am aware they not twins but they are litter mates who look a lot alike. Sapphire catch on to the training much faster than her brother although they are both super smart and easy to train. Sapphire has ton of character and I never know what she going to do as she is always a goofball. While Turbo who I affectionately call my velcro does never wants to leave my side so working on a recall has been a challenge. Why do I need a recall with a Velcro dog well he runs off if he with my sons and can not see me. So he need a recall for his safety in those cases. Sapphire as I stated is a clown and training her recall although easier was full of funny moments.