you can sell the horse by resetting the skills at the animal trainer. you can have at least 3 pets not there are the new fighting pets and also you can have one drake one horse or two of each but besides that you can color them and lvling them as you grind is fun and i get really giddy when my pet is about to lvl i also have a AFK pet lvl the bad thing is its lvl 7 but it is good for lvling the pet to lvl 20 and putting on another char...here is the URL if you really need it
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http://www.aeriagames.com/