Idea is great
some inputs:
1. pets must be fed. So food supplies for pets can be made money burner.
2a. Pets can have short taming process. then they should not save their progress over boots.
In this case power of tamed animal would depend on guild status of breed.
2b. pets can have very long taming process. then they should save their progress over boots.
In this case after advancing to new guild level, Breed will have dilemma to stay with current animal or look for new more powerful one. Which is good

3. Guild stat or regular stats shouldn't be a factor in taming or breed specials. I think more about amount of animals you tamed to maximum level or something like that. (Progress in guild shouldn't be XP grinding, but something more interesting)
4. Animals stats should be taken into acount when taming and animal combat.
Idea is great, but I don't believe in fairy tales. It never will be implemented (counts for draco idea too)