Yes and no:
One pet tamed by owner and followed command by first owner is fine.
i have another character received a greater dragon from another player, it failed to follow commands more often. I have to feed it very often.
Both are 120 tamer and lore. Not sure why but sharing experience
Yes, I noticed a change in maintening pet loyalty in one of the recent patch (the patch when they put a cooldown on +skills jewels swapping) , I run 110 taming 115 animal lore to control a 5 slot bane with 108 requirement, and I can sometimes fail 3-4 times in a row a command, also if you run +taming or + lore on jewels, if you die you might be bugged and loose taming or lore skill , until you log out and back in, its a new bug... just saying
And another note on this bug, I fear it apply to all +skills on your jewels, so if you die, you somehow loose those skills even tho it shows you got the skills , until you log out and back in, then you get the skills back.
So if i was to put a priority somewhere, I'd fix that bug over all other current bugs right now , you can loose pets because of this bug , no one should have to relog to get your skills back
My tritons lose their loyalty really fast when I do tmaps with them. But during the invasion they stayed at wonderfully happy the entire time.