[jackie_hubert]

Sounds like a lot of typical puppy behaviours. Cosmo was the most calm and aloof puppy I have ever met and I've met a LOT of puppies (I work in a shelter) but at 4.5 month he turned into a high energy bundle of crazy. He is very food motivated though and knew many commands by 9 weeks, so maybe use a different type of reward to get him interested or simply something higher value - cooked chicken or toys.

As for the leash walking, whoever this trainer is that said to just drag the puppy along doesn't sound like a good trainer. I know that Brad Pattison, one of the TV dog trainers, recommends this and he is definitely NOT someone I recommend. Make walking really exciting (bring a squeaky toy and squeak as you kind of run along in the grass and let him grab the toy once in a while) but realize that at this age puppies are really den oriented and will often run back to their home asap. Try taking him out to a new place, the park, etc. to get him away from thinking about going home. The wanting to inside will change soon and you'll probably see the opposite.

What were the parents like? What's his pedigree?

 

[jackie_hubert]

Oh and I would also recommend looking into clicker training. This might help with the lack of motivation while training. It's a fun and positive way to train and will make it more clear to him what it is you want.

 

[jackie_hubert]

To a puppy chewing and nipping are part of play. He's probably confused why you are yelling when he's just doing something normal. Yelling rarely works, plus you want your puppy to associate people with positive things not negatives. Pushing him away also makes things more interesting sometimes so it's not necessarily very useful.

The most popular method to deal with nipping is to give a high pitched "ouch" and walk away immediately - it has to be veryvery quick and obvious. If you can walk out of the room it's even better. Once he's calmed give him a toy and praise madly for taking the toy. Always have lots of toys handy.

And it takes a lot of repetition and must be done consistently to work.

Good luck!