15 week old pup

[Mairyhinge]

Hi, I've posted before, just after we got trigger at 8 weeks, when I was in the midst of a breakdown!
Well he's doing good, mostly, but today has driven me bananas and I need advice.
Good points...he's 97% house trained, very rare he pees in the house, and never has pood and still doesn't.
He can sit, lie down, give paw, stand, stay.
He goes at least 7-8 hours at night in his crate and is happy in there.
Bad points..he's started crying when I leave the room, stands at the bottom of the stairs and cries, not for long tho, so this isn't a big concern.
He's still biting and mouthing, I've now got a very weak vinegar solution in a spray bottle if he's on anyone's ankles, but then...
He barks, and growls, and goes for the feet and ankles, a lot. Which is exhausting.
I've done the yelping. I've done the turn away. I've done the alternative toy, he's too fixated on the feet to care! Also..
He pulls really bad on the lead, and he' jumps all over other dogs and up at people, these I need to stop.
So, please offer me what's worked for you? I've googled, I've read puppy books, ( that he's shredded when he's got hold of them!
Today's been bad, really hard, so please help me to help him!

Teething lasts a whole year so you just make sure you don't leave anything you value (shoes, books) in puppy's reach.
Puppies are a handful till they're a year old when they suddenly grow up.
Ignore the whining. Shut him in the crate if you're going upstairs and let him out immediately you return.

A harness usually solves the tugging on the lead problem.

It's no consolation but they grow out of it! My pup was a sod for the back of the ankles. We just ignored it as best we could, she just stopped. The only thing I can suggest is making sure ankles are sufficiently covered.
The jumping up. Don't let him get that close to strangers when on the lead. Establish sit and reward him for doing it with something high value. When a stranger approaches, tell him to sit and reward him. It will take time, but you can practice this at home with family/friends.
Our jrt was a bugger for jumping up on guests, so they were briefed before entry to the house to ignore him and turn away from him. He would just give up because no one was taking any notice of him. This worked for us anyway. Our pup is now 9 months, and has really calmed down in the past few weeks, having been an exhausting whirling dervish since we had her, and yes, she drove me bananas too, so I sympathise.