
This may or not be as bad as it seems. Things are rarely as Black and White as that. What is the quality of the breeders stock, do they health test, do they prove their dogs in some field (show or work), in other words what are their reasons for breeding over and above producing pups to sell.
I have in the past had two litters at the same time (2006) and on another occasion 3 1/2 weeks apart (2011). In both instances one of the litters was conceived after travelling abroad, so a bit more of a risk re likely success.
Sometimes it works out that way with bitches coming in season early or late, the age they are the age of the studs to be used and their availability, there are other years when I did not breed at all.
It is incredibly hard work. With the first instance doing two of everything at once, and with the second occasion the puppy rearing lasting 3 - 4 months instead of the usual 8 - 12 or so weeks.
I was going to mate two bitches this year, the older champion bitch who had already missed twice last year, and it was time for the youngster to have her first litter at three.
In the event instead of the older one coming in season 5 or 6 weeks after the younger, as in last two seasons she came in a week after!!!
As she will be 7 in July (I prefer not to breed after 7), I have decided not to mate her and she will be spayed after having just two litters. A shame as she is a top quality bitch.
I decided that I just would not be able to enjoy the puppies if I went for the two litters together.
Now the situation you have found may in fact be someone breeding to the max for commercial reasons, or maybe several family members are involved in the two different breeds, or the breeder may have similar considerations as above.
Certainly a breeder who single handedly regularly bred on this scale I would wonder about their motives for breeding, and question if they could provide the level of care to them all.
Remember in some breeds litters of 12 or so pups are common where in other breeds that would be two (as in mine) or three litters.