thanks for the info, yes, I know for a fact she's only 11 weeks old , she a yellow lab and our other dog, also a lab, black is two...when we introduced the pup to our home she started this behavior right away...I think she's trying to establish dominance over the other dog in the house..and I have been redirecting her focus when I catch her doing this, so I'm hoping it's a phase she will soon outgrow...thanks again