What is my white boi mixed with?

He’s very obvious a lab but he’s short and has a bit of a longer body. He’s about a year old and is 42-45 pounds. He’s got very few tan markings (one patch on his back and a little on the ears) and he’s got tan freckles on his feet and legs that are barely noticeable. He’s really good at standing on his hind legs and holding it for a long time. His ears are like flopped perfect triangles but really stiff

My boyfriend suspects Red Heeler I think he’s mixed with Jack Russell or Beagle

Yall let me know what you think 🤔 I’m getting a DNA test done soon and I’ll be back with answers!