I agree with starting as soon as you can. Bring them up the way you want them to be..lol..dont wait for bad habits and try to chage it then, will be hard on the person and the dog..how do you train a dog to roll over?? Sammy is well trained can even shake paw, but roll over confuses him he just lays down and puts his nose under as far as it will go, he seems to think its something hes done wrong.so I quit trying to teach it. Dont know how to get him to undersand it. And dont want him thinking its something wrong. Hes so cute..lol..He even does La La, when he climbs up in my lap I say La La and he puts his head on my shoulder and i rock him..lol.lol..so cute..lol..