My previous dog was all lab. He was 16 weeks old when we got him, and we were told he may be "vicious." A lab? Surely you jest.
He was nippy. We trained him. He responded well to training. He was a fantastic family member for nearly 12 years. I took him to work with me every day. He was my constant companion his entire life.
So fast forward to the new dog, our house is small, so I wanted a smaller dog, if any.
So my wife gets me the half beagle/half lab.
Knowing nothing of beagles beforehand, I didn't expect any problems.
All I can say is that the beagle stubbornness is a dominant trait. As is the baying. The digging, too. Burying your treats, bones, etc., inside furniture, too. He looks like a lab, acts like a beagle.
Beagles are born troublemakers, I think.
But I wouldn't trade my half beagle for anything in the world.