As Luke grows up he'll be more interested in all the scents and other new and interesting things outside than he is in tugging on his leash. Also, when you start training Luke to heel that will be part of what he learns. Just keep in mind that some puppies start doing things earlier than others, not necessarily because they're smarter, but because they are like we are - some just mature more quickly than others. I have to remember that with Shiva. Bimmer and Buffy never really had to be taught anything, they were dogs who matured very quickly and rarely had to be told anything more than once. Bimmer's part wolf, and if wolf puppies don't learn and remember their lessons quickly they don't survive. Buffy was, well, Buffy was just Buffy. I don't think she ever thought she was a puppy. Shiva's very much a baby and forgets sometimes, but that's part of her personality and it makes her very sweet. Luke sounds like he's a lot like that.