Doctor Horse

Doctor Horse (or Doctor Horses) is a male pony who appears in the episodes Read It and Weep and Equestria Games. He is a unicorn in My Little Pony Friendship is Magic and some merchandise, while he is an Earth pony in most merchandise. He has a cream caramel coat, caramel brown or yellow mane and tail, dark cyan eyes, and a cutie mark of an electrocardiograph monitor. He works at Ponyville Hospital as an M.D. He is unnamed in the show, only being addressed as "Doctor" by Twilight Sparkle and as "Doc" by Rainbow Dash, but he is named in merchandise.

Development and design
Doctor Horse is identical to S04E12 Unnamed Unicorn Stallion #1 in all but usually mane and tail color and cutie mark, shares his mane and tail style and usually colors and coat and eye colors with Caramel and "Toffee", shares his design and rarely mane and tail colors with S04E24 Unnamed Unicorn Stallion #1, shares his design with S04E22 Unnamed Unicorn Stallion #2, "Black Marble", and sometimes "Star Bright", and "Noble Laureate", shares his mane and tail style and coat and eye colors with "Sunburst", shares his mane and tail style, eye color, and rarely mane color with S04E24 Unnamed Earth Stallion #6, shares his mane and tail style and rarely color with "Dewdrop", "Sunlight", "Cloud Break", and S04E26 Unnamed Earth Stallion #1, shares his mane and tail style and eye color with S04E06 Unnamed Earth Stallion #2, S04E08 Unnamed Earth Stallion #12, "Strawberry Cream", S04E24 Unnamed Earth Stallion #4, and sometimes Cherry Fizzy and "Serenity", shares his mane and tail style with Royal Riff, Golden Delicious, Wensley, "High Note", "Black Stone", "Starburst", S04E06 Unnamed Earth Stallion #5, "Burnt Oak", "Cormano", "Gingerbread", S04E22 Unnamed Earth Stallion #2, S04E22 Unnamed Earth Stallion #1, S04E22 Unnamed Earth Stallion #9, "Silverwing", and sometimes S04E22 Unnamed Earth Stallion #7 and S04E20 Unnamed Earth Stallion #1, shares his mane style and eye color with Ace, shares his tail style with S04E10 Unnamed Unicorn Stallion #1, S04E08 Unnamed Earth Stallion #6, S04E08 Unnamed Earth Stallion #10, and stallion "Snappy Scoop", shares his eye color and sometimes design with "Sir Pony Moore", sometimes shares his mane style with "Arpeggio", shares his coat and sometimes mane and tail colors with "Creme Brulee", and sometimes shares his coat and/or mane and tail colors with S04E22 Unnamed Earth Mare #19.

Doctor Horse's name is a play on Dr. House from House.

Season two
In Read It and Weep, brown-maned Doctor Horse, with his cutie mark, makes a speaking appearance.

Season four
In Equestria Games, yellow-maned Doctor Horse and yellow-maned S04E12 Unnamed Unicorn Stallion #1, one with no cutie mark and the other mostly obscured by "Parasol", make non-speaking appearances.

Merchandise
Doctor Horse appears as a brown-maned Earth pony with his cutie mark both on the Season 2 poster/DVD set packaging/T-shirt/WeLoveFine.com iPhone case and on page 30 of Little, Brown's guidebook The Elements of Harmony, the latter of which lists him as simply "DOCTOR".

Doctor Horse is named on his Enterplay collectible card game Canterlot Nights expansion set card #85 F, which features him as a brown-maned unicorn with his cutie mark and gives him the description "Many lives have been changed by Doctor Horses' [sic] advanced research into the study of Lazy-itis."