When determining that kind of rule (I.E. Something + hit dice), hit dice is almost always the number before the D in a D8.
If you see an animal having 3D8 hit dice, the number you want is the 3.
Rearing is permanent, as you are essentially raising it from infancy to domestication.
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question 3 is their a book that explains these rules better than the phb?
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No, and the PHB explains the rules pretty clearly actually. Just read the rules myself and understood it perfectly.