Genetics in plain terms

Genotype is the set of genetic variants a dog carries. Phenotype is what you can actually see or measure. Two dogs that look similar can carry different hidden variants, which is why two alike-looking parents can produce surprisingly different puppies.

Some traits are dominant, others recessive, and a dog can carry a recessive variant without displaying it. That is also why coat colour does not reliably predict temperament — the genes for colour and the many genes influencing behaviour are not the same.

Behaviour, health and appearance can all have genetic influences, but they are shaped just as much by early development, the maternal environment, socialisation, learning, health, life experience, handling and individual variation. Avoid any claim such as "this gene makes the dog aggressive" — it is not how genetics works.

Standard German Shepherd coloursView source for this information

Recognised and commonly seen colours include black and tan, black and gold, black and red, sable, grey sable, dark sable, solid black and bi-colour. Shade names and registration terminology can vary between countries and registries, so the same dog can be described differently depending on where they are registered.

Non-standard or disputed colours

Blue (dilute), liver, white and panda/white spotting occur but sit outside the German Shepherd breed standard. Some are actively promoted as "rare".

"Rare" does not automatically mean healthier, better or more valuable. Colour should never take priority over health, temperament and responsible breeding.

A white German Shepherd is not simply a standard-coloured dog in white. The White Swiss Shepherd Dog is now recognised as a separate breed. Merle is not a recognised German Shepherd colour, and any claimed merle German Shepherd ancestry should be verified carefully rather than marketed unquestioningly.

None of this is a judgement on owners whose dogs have non-standard colours — only on how those colours are sometimes sold.

Coat typesView source for this information

The standard (stock) coat and the long stock coat are both recognised varieties, and both have a double coat with undercoat. Coat length is not the same as coat density; some long-coated German Shepherds appear to have a less obvious undercoat.

Double coats shed year-round and blow heavily twice a year. Shaving a healthy double coat is usually inappropriate — the coat helps regulate temperature and protects the skin, and it may not grow back normally.

Responsible use of DNA testing

DNA testing can confirm certain colour variants, identify carriers for some known inherited conditions, support parentage information and help responsible breeding decisions. It cannot guarantee health, predict a whole personality, replace hip and elbow assessment, replace veterinary examination, or prove a dog is "better bred".

A DNA panel also cannot reliably turn a mixed dog into a percentage-based behavioural prediction. For inherited disease screening and joint scoring, see the Health section.