Welcome to YT! I honestly don't know what is a good age and or weight to start leash training but I'm sure you will get a good response here. I started my girls at about 5 months because I felt comfortable with their size and stability. My new pup is afraid of the leash so when I can keep and eye on her I will put the harness and leash on and have her just drag it around the house to get used to it. Welcome aboard and good luck!!
