What Breed Is My Dog?

I got this puppy when she was 5 weeks old as the owner had 7 pups saying they were moving and had to find homes for them. They were supposed to be Boxers, as the parents were, and we saw her at 5 days old and selected which one we wanted. As we saw her waiting for time to go by, she looked like the Boxer she was to be. Then when we picked her up at 5 weeks her nose was out further and I felt she looked different than my last Boxer by a lot. The owner we got her from said the mother was like that and as she got older she looked more like a Boxer. This one has a slight howl when someone leaves and I run a sweeper. I never knew my other one to ever do that. She barks non stop and other things that make me feel she might have Beagle in her. I need someone to tell me what they see.