Colouring in Labrador Retrievers can be pretty complicated:

• https://en.wikipedia.org/wiki/Labrador_Retriever_coat_colour_genetics
• https://www.thelabradorsite.com/labrador-colors
• ​https://www.oakhillkennel.com/library/color.html​
• http://www.labbies.com/genetics.htm
  

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