I used to be crazy about any animal, with the exception of snakes. I went through an obsession with horses for a while.
Then I got into goats, and while other pet-type animals are OK, they just can't compare in my opinion. Goats have an appealing combination of friendliness, curiosity, independence, and brains. They're also utilitarian- they produce milk, cheese (and yes, meat), and not only does their poop stay outside in their pen, but it is useful for the garden instead of being an odious chore to dispose of.
Also, I can spend lots of time analyzing and categorzing the type (conformation) and production (milk and butterfat) data and do lots of research and draw up all sorts of charts, planned pedigrees, etc etc... they make a good obsession.