There aren't any cheats available on Howrse. Sorry :(
try pony island (good) or my stable(not as good)
about 75 BLUP is good on Howrse, -100 is the worst, 100 is the best, and 0 is neutral
Yes, it is really fun.
No. RuneScape has no cheats.
I make them :) I am on UK and internation howrse. My username is AbbiNewton. PM me on either servers, and I will make you one :)
For howrse, they never wear out.
Thoroughbreds
Howrse Quizz was closed down in January of 2010.
Howrse puts your prestige and deals with. You don't need to worry. The prestige is only telling you how good your ec is.
You need to have 10 karma points and have a good record on howrse. Also, you need at least 2 horses.
Google.
On Howrse Helper (google it) there is a list of people that can give black market items.