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suggestive195618 edit178931 edited screencap94498 screencap301096 pinkie pie263030 twilight sparkle367489 pony1670257 g42101978 aqua teen hunger force323 caption26560 estrus2308 female1878113 halloween13402 implied sex8520 lesbian121649 nightmare night6189 on back36391 out of context5191 ship:twinkie2476 shipping263061 tonight you113
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Background Pony #06ED
@gallagher117  
Pretty much, but it’s just a regular sterilized marble (no hormones), and it just stops the signs of estrus, for a few months, in only 2 in 5 mares.
Background Pony #670A
I’ve learned more than I’ve wanted to know about horses, from the fandom. X D
gallagher117
Platinum bit -
Heart Gem -
Wallet After Summer Sale -
Happy Derpy! -
Silver Supporter -
The End wasn't The End - Found a new home after the great exodus of 2012

can't have nice things
@Drax99  
It’s a spherical glass IUD. Somewhat commonly used on real horses, if what I’ve read is to be believed.