The Plutos' Parchment cannot be bought with passes and as far as I am aware (and through personal experience) they can only be gained from Horns of Plenty.
If you have any more questions, my username on Howrse is RaeMatex.
Your horse will produce manure the day after you take care of it, unless it has a Ploutos's Parchment, in which case it will produce equus.
You pick a horse that you own on howrse and scroll down, there near the bottom bellow "REPRODUCTION" there should be another tab that says "GIFT MACHINES" and there you can remove the Ploutos' Parchment. Do keep in mind once you click remove you DO NOT get it back the game simply takes it than credits you Manure for the Gift Machines. Hope this helps.
Pluto's Parchment is a divine item on Howrse.com that can be used to increase a horse's skills by 100 points. It is a rare and valuable item that can only be obtained through events or promotions on the website. Players often seek out Pluto's Parchment to give their horses a significant boost in performance.
plutos core kills us from coldness
Yes. Charon, Plutos largest moon, is about 1200km in diameter, while Plutos diameter is around 2322km, so Plutos diameter is about twice the size. In terms of volume though, Pluto is around 7.4 times as big.
Monkeys
2.03g/cm3
it rotates to the right
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meh
1,134 km
Yes it is