hector,
as long as dogs can be killed even if their owner is flagged PVE and even on PVE maps… you will just lost items on top of losing the time you invested in training your doggo.
there is a suggestion to at least dogs give infamy when a player kills them. my postings in that thread ask for the dog being not targetable if user on PVE flag or on PVE map.
take a look… I think we should go step by step. first a dog that has a chance to survive a bit.
then items.
(in general sure – my own RL doggo has a doggo rucksack. perfect for groceries. he is big enough for this however. I would not pack a rucksack on a pug 🙂
so the idea as such – to let dogs carry items – is sweet. but first the dog that is supposed to carry those items needs some kind of protection.