What a beautiful dog! Love her tuxedo markings! She does look like she could have some lab in her, but the only way to definitively know is through DNA testing, as Curls above suggests. Embark would be a good place to start, and may be better than some of the others although I hear often how even they get it wrong from breeder friends. Would be interesting to see if she's Merle dominant. Please let us know if you do the testing; I'm so curious!