Can you find a deer hit in a non-vital area?
Define non-vital?
You could shoot the tail off a deer with a .50 BMG and it would run off and you couldn't find it, with or without dogs.
Honest answer... I've killed over 80 deer with buckshot, only 1 was hit with 1 buckshot and it was at 20 yds and it dropped him. Only 1 ever got away. Knowing what your gun will do and taking good shots is the answer, same as shooting a rifle. When you can only see 30-40 yds or less, buckshot will work.
The advantage of buckshot in a thicket is this. You can shoot thru the brush and have more opportunities to make a hit. Some shot will hit limbs, but some will get thru. If a rifle bullet hits a limb, will it get thru? Dont know.
Agreed they usually dont bleed as much, but I've only lost 1. Most have piled up right there.