I have used primula cheese for toilet training with all mine. It was suggested to me by a dog trainer as she thought it would solve the problem of me bending right down to a small pup (I use crutches and a wheelchair) so it came from there.
I kept it for purely toilet training then it became something special for going outside, together with loads and loads of praise. I squeeze a little bit out so its a blob on the end of the tube and they lick it off.
None of mine, including an incredibly greedy Lab, have managed to suck the contents out!
Used like this a tube lasts ages and they then don't over do salt, fat etc.
Barney adores it, and once he was toilet trained I switched to use it for interactions with my neice, who he's not keen on after she hurt him.
All mine have pigs ears without a problem. I would say 9 weeks is too young for a pigs ear too.