OH MY! wiss329, Your avatar is so adorable.
I just had to mention it.
We started training Bubba right away when we got him at 9 weeks. First was bite inhabition.. a must have IMO. Then we started Sit, Down, Wait (I used that word instead of Stay)and Let's Go is the command we used instead of Come due to neighbours kids trying to call him over the fence. GRRR So I didn't want him to respond to 'come' or 'come here'.
Bubba did the same thing.. rolling over, chewing on the leash (you should see his leash.. lol It's falling apart now) ignoring me, ect. I found that if I used yummy treats that I could re-direct his attention back to me. I'd say his name and as soon as he looked at me I'd praise him like crazy and give him a treat. Everytime I lost his focus I'd do that.
Maybe you could give that a try?