My Mom always had Doxies while I was growing up, and they are wonderful little diggers... I mean buggers!

She even got into breeding for a while, but had trouble parting with the pups when the time came.
While diet and crate training are certainly concerns, what really upsets me is the rough handling of the puppy.
These little darlings are NOTORIOUS for having back problems. I've seen several that have had to have surgery because of rough handling or being dropped, and it usually leaves them paralized in the back legs so that they need a 'walker' in order to get around. It just breaks my heart.
I pray that you can get through to these people before it is too late. Good luck, and keep us updated.
Villette, those are a couple of good looking guys you got there!