Remember!
EE/Aa/Dn is a quicker way to say the creature has two "E" or black/eumelanin genes, one "A" or red/agouti gene, and one "D" or dun gene
When explaining genes in this guide, the _ symbol will be used to note that the gene in that slot doesn't matter visually, because the gene listed is assumed to be dominant
ee/_ _ means that the genes in the "a section" can be anything in the "A series", and the creature will still look the same visually (in this case, red).
Genotypes for characters should always list some form of ee/aa, because these tell you what color the base coat is, but additional markings can be left out if they only contain n "null" genes (so you don't have to write Ee/Aa/nn/nn/nn/nn/nn/nn... )
All creatures have a Base Coat caused by an E/Eumelanin/Black gene and an A/Agouti/Red gene. Any additional marking genes appear on top of the base coat.
Basic colors occur when a creature has ONLY E/Black or ONLY an A/Red series gene, but not both!
Agouti genes follow a strict hierarchy, and one gene will usually override or hide the second. So for example, Wild Bay is dominant over Wolf, if a creature has the genes/alleles for Wild Bay AND Wolf genes, only Wild Bay will show. (However, they can still pass either Wild Bay OR Wolf genes on to their offspring!)
The hierarchy, from most to least dominant is: Wild Sable, Wild Bay, Sable, Wolf, Mountain, Seal, Bay, Brown
Dilution genes, predictably, dilute the color of a creature to be paler than it normally would be. Some dilution genes affect the entire coat, red and black. Some only affect red hair, and some only affect black hair. Most dilution genes are Codominant, meaning the more you have, the paler the color gets until the creature might appear entirely white.