It doesn't work
They are not in minecraft by default. You have to install a mod...Mo Creatures I think it is.
You dont >:D
Mo Creatures is free. If you didn't know that, you have a bit of learning to do before you attempt to install a mod.
You download it, get the modloader, and install it. Check youtube to see the steps one by one.
Mo Creatures is a modification (mod) for Minecraft. You can get this mod by downloading it from The Minecraft Forums.
You go to %appdata% in start, run then click .minecraft then click bin and open the minecraft.jar with winrar or 7zip, delete METAINF and transfer the class files inside the mo creatures zip to minecraft.jar, Voila!
Minecraft Does not have horses.. However The MO' Animals mod has Horses in it. So it is fairly easy to install if you know what your doing. :)
If the portal mod is not compatible with the Mo'Creeps and weirdos mod you can install Forge API to make them compatible.
Mo' Creatures is a modification (mod) for Minecraft. It adds new mobs like sharks, elephants, horses and more.
Open up the .minecraft folder, and then open the bin folder, and then open the minecraft.jar with win-rar. Then drag all the .class files into that folder, then delete the META-INF folder. Then you should have the mod.
It depends on which server vendor you are looking into for starters. For example SQL Server Mart has three different monthly, tiered plans, ranging from $4.99 /mo, to $49.99 /mo and $149.99 /mo.
Horses are not a mob yet in Minecraft, but they are available on Mo' Creatures.