My adult son has three dogs, two hamsters, a parrot, and two mice; is this animal hoarding?

How many is to many. What about a wife and kids? Santorium has 7 kids and bachman claimed to raise 23 kids, is that child hoarding?
Not necessarily. If he is able to care for his animals and they do not interfere with his life function - it is doubtful that having 8 animals is hoarding.