Are you getting a work visa? Perhaps a license to kill?
The breeder SHOULD ask questions. It's the right thing to do. Three letters of reference and urine sample? Too far.
The DNA samples, however, are just frightening. Look out for frame ups.
Seriously though, our local Humane Society asks questions like that. If you have a back yard. If you give medicine and are willing to spend thousands of dollars. If you sneezed on your dog at age 3. If you ever wrote for a communist-friendly dog magazine.
I hear horror stories of the place (I'm a journalist) from people who wanted to adopt a cat. One lady told me her mom went to adopt one. She was turned down because she was old (and thus wrinkly, something for a cat to grab onto or something weird like that), and didn't make enough on her pension.
So the lady went to the next town over and wound up with two cats and a sizable donation to the SPCA.
A good standard from a journalist's perspective: if anyone asks you a question that may come up in court during the murder trial of your wife whom you insist was done in by the one armed man, don't answer it.
Advice to pass on to your husband: After talking with a few breeders and meeting a few, the experience of going through a rescue was a wonderful and in fact, we're rescuing another. Also, it doesn't cost $14,300,383 for a freakin' breed that doesn't exist (see 'doodleplex').