Help!!! My new puppy, Sandy, who is 9 weeks old, wants to eat everything outside. When we take her out to do her business, all she wants to do is dig at the grass, eat the grass, eat acorns,sticks,rocks, anything she can reach. We have her on a light leash and she just pulls and pulls almost choking herself. Is this normal??? She acts like psycho dog outside. Any info would help.