A scam listing almost always refuses to put anything in writing. A real breeder will send you dated health records, a purchase agreement and clear delivery details before you pay.
Watch the payment request. Gift cards, cryptocurrency, wire transfers to an individual and app payments marked as 'friends and family' are all untraceable by design.
Reverse-image-search the photos. Stolen stock photography is the cheapest part of a fake listing.
Ask for the purchase agreement and health guarantee before any money changes hands. A seller who will not put terms in writing has told you something important.
Be sceptical of sudden extra fees after a deposit — a special crate, insurance, a customs charge. Legitimate transport costs are quoted in writing in advance.
This guide is general information for planning purposes and does not replace advice from your own licensed veterinarian or a qualified trainer who knows your dog.