I like questions 
 
 @Shawn: Yes, they eat according to their shape, but are more likely to stay away from meat (some Equihu don't eat meat at all). 
If an Equihu 'hides' their race by becoming a horse, they will most likely be used as a horse. I have one character (his name at the moment is Castor) who is captured by the Zarack and, since he hides in horse form, they use him as a regular war horse in battle. The Burgansies are the only ones who treat them differently. Differently because the Dwarves and Zarack see them only as an objects to be used against the other race.
They normally live alone (i.e. one family) or in small groups (i.e. 3-6 families) though some have begun to live in cities. They're friendly, but not very... open, as in they aren't likely to approach someone, but will not be angry if approached. 
Because of the way they are treated, the only race (outside of their own) that they 'like' are the Burgansies.
@Strings: the before mentioned Equihu (Castor) is actually a dapple grey 

 and when he takes human form his skin is grey with darker lines (like when your skin gets cold and you see the faint blue-ish outlines? just as grey and darker grey)
Markings are rare on Equihu, but once in a while a child is born with markings. This can only happen if the child is born as a horse. Since they are rare, children with markings are seen as special and great is taken to protect them. (I just had an idea for a short story about a paint Equihu 

 that'll look interesting)
If an Equihu is born with markings, the markings will appear in the spots in their human form. A left hind sock would be on their left foot.
A few other things about colors:
Their hair is the same color on either form. black hair, white hair, brown hair, sometimes mixed for paints.
The colors of their hooves are the colors of their nails. White/cream hoof = normal nails. Black hoof = black nails.
And some random facts:
Their name for child/children is Yahandu/Yahandi.
Urmatill is when a Yahandu 'comes of age' normally at around twenty.
Equihu lived according to their human years. (they don't have an average lifespan of only 25-30 years)