XD My friend wanted a species lol. I decided to take a stab at it and added a few animals.

Species Involved:
Clydesdale
Greater Kudu
Eland
Waterbuck

Notes:
Females are very big and dominant. Females actually fight over males to mate with. The female still bares the offspring. Male's sperm tends to be hard to regenerate and some tend to go sterile for a few years at a time. So this is reason for the females to fight it out amoung themselves. Females tend to share the same behaviors as pestering males and following them around. Males also engage in fight amoung themselves especially if a female is around. It's more light hearted then the female's because all their trying to do is impress and show their worth to be chosen.

Both:
-Fangs
-Horns
-Beards
-Cheek Hair
-Back and Shoulder Hair: Can vary Texture.
-Feather Feet: Tend to be on the longer side but some come with shorter hair styles.
-Neck Hair
-Fluffy Tails : Tails vaty in shape and for but tend to be around the same size. (Unless its super long hair that makes it appear longer.)
-Size: They tend to be around 22 hands in size but males are a bit shorter lol.

Females:
Unlike normal gender roles, females are big and bulky. They have more hair for protection as well as Armor plating.

-Big Horns : Females spar and get pretty brutal
-Face Plating: They will sometimes bash heads like gosts on some cases. The armor gets really think upon their forehead and above for impact.
-Face Horns: They will try to stab their opponents in the side and rather not use their bigger horns to do so.
-Fang's: All females have long Fang's: there not used for much but more primitive genetics
-Manes: Females can have every type of mane of horses and none horses. Though most tend to have medium and long. This is more a status amoung them. More dominant the mare the longer her manes will be. (Though more for the rut seasons.)
-Horns: The top most set of horns is always Large! The second set is always about half the 1dt size. Also their horn shapes tend to vary marrto mare. Though less deer horns and more goat, gazelle, antelope, and other relatives. (There are deer like but none will be full deer or moose type horns.)
-Shoulder Hair: Always big on females because its a display of rank and health.
-Shoulder Armor: just more protection from other mares. Long horns tend to end up in hurtful places.
-Long neck and Face Hair: More for protection against stray horns. TXD
hair is thick and helps calm blows.
Tail: Females tend to have more fluff compared to males. Though tails vary in hair styles. Though tend to be about the same length bone wise.

Males:

-Smaller Horns: Tend to be shorter and tend to be less fancy. Most have goat type horns.
-Plating: Tends to much smaller and less thick on the face and body.
-Fangs: Tend to be smaller but some do get longer ones. Just kind odd to see sometimes. XD
-Manes: Tend to be short! They don't get a long beautiful manes lol. Though they tend to spike up or even Zebra type hairs grow. At the most males might have a low medium cut of hair. (Though maybe some genetic freaks out their.) They also serve the same purpose of display of health and dominance amoung their peers.
-Neck Hair: There is a patch right at the top of the neck where is gets very fluffy. This is a males display. The females have this but its much shorter and less impressive. You can always tell a male at a young age by it's hair length.

General: Males tend to be smaller and just a "lesser" version of their Females. XD They tend to be more mellowed natured as well.