With the Dobermann, a price well below the usual range of 1,500 to 3,000 euros is a clear warning sign, since the cardiac and genetic testing of the parent dogs alone costs a lot. Walk away immediately if the seller can't show current heart results (ultrasound and Holter) or claims that a simple listen with a stethoscope at the local vet is enough for breeding.
Another major warning sign is the marketing of so-called "special colors" such as blue or fawn (Isabella) as a supposedly exclusive rarity: these dilute colors are directly genetically linked to color dilution alopecia (blue dog syndrome), a severe skin disease with hair loss and inflammation. Puppies offered with cropped ears and docked tails are also a clear deal-breaker – in Germany, the legal ban on cropping and docking under § 6 TierSchG (the German Animal Welfare Act) applies here. Shy, excessively nervous or aggressively defensive mothers and isolated kennel housing without family contact are likewise signs of puppy mills that in no way do justice to the Dobermann's demanding temperament.
On HonestDog, every breeder goes through a sign-up process before their profile goes live: an identity check with ID and selfie, proof of club membership or a §11 permit (the breeding license under Germany's Animal Welfare Act) where applicable, a knowledge test on breeding and animal welfare, and agreement to the HonestDog breeding standards – including no breeding with extreme-breeding traits and no breeding dogs under 18 months. Without a verified §11 permit, a breeder can list at most two breeding females there, and you can flag anything odd on a breeder profile directly via "Report content". When you visit, ask to see the parents' original results. You'll find current litters among the Dobermann puppies on HonestDog.