Yes you can, I've had 2 balls per pet in the past when the insurance bug was a possible threat, one ball in my backpack, and another in the bank box. For the proposed changes, I see more pet deaths in mob situations where they just won't follow you away, even with 120 lore, vet, and taming. Silly pet just wants to keep bashing aggressive critters even to it's dying breath. I hope if the 15 seconds reuse remains, they quickly learn a better follow me and leave the nasties alone instinct in the near future.