Let's see - is not listening except when he wants a Beagle thing? Most definitely - believe me, with two Beagles that I have had since they were 8 weeks, definitely normal and definitely a Beagle thing. As for the growling - I need to get a video of Shiloh and Shasta playing tug - you would think Shiloh is raving mad and going to attack Shasta at any moment.
And Petsmart for training - I'd use it - both of mine have been through different levels of obedience training. Besides the obedience stuff the pup learns - it is also a great place to learn socialization skills and becoming accustomed to different sights and sounds. Bak to work I go.