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The thing about grays is that they all continue to lose pigment as they age, some faster than others. In real life, the flea-bitten grays will continue to show small flecks of their base color over their bodies throughout their lives, but I don't think that effect appears in the game. In the game, as in real life, all horses with heterozygous or homozygous gray will end up white. Dapple gray is a stage in the graying out process and tends to be rather short-lived.

Here is a sequence of gray horses at increasing ages to demonstrate. I'm listing them with their base color to demonstrate the effect of gray on both red and black coats.

3 years old bay

Dance Royale

4 year old black

92618 Ex Pro Olw 5

5 year old black

8418 Ex Pro Olw 7

6 year old chestnut

Joyous Music

8 year old bay

51818 Ex Pro Rb 8

9 year old bay

42118 ex pro tobi 4

10 year old chestnut

22518 Ex Pro 1

12 year old black

Quantum Shadows

There is always some variation as in real life, but as you can see, black (E) seems to resist graying a bit more than red (e), but they will all end up white.

14 year old bay

FRxf Framed elf

16 year old black

Drowning in Magma

My daughter has just said that she thinks homozygous grays will go white faster than heterozygous grays, so breeding homozygous gray stallions to mares without gray may produce horses that cling to their color a bit longer.

Well, dangit. I suppose I'll have to get my dappling fix in a non-grey manner. I suppose that's why it's goals, at least!

This game will teach you more about horse color genetics than you ever thought existed. :D