I have a 10 month old lab and he’s never behaved like that. He does still want to mouth us sometimes (normal) but we redirect to a toy. He generally likes something in his mouth when he greets people so we keep a toy handy to give him that, rather than a hand or clothes.
A few thoughts:
Is he sleeping enough? Dogs need 18-20 hours sleep a day. An overtired dog is like an overtired toddler and it leads to behaviour issues. Work on sleep if he’s not getting enough.
You need to teach calm. Reward him for lying down and being calm. Think human pez machine. Lots of treats. He needs to be calm everywhere. Start at home, then in the garden, then spend some time in the park sitting on a bench once he’s run the sillies out. Only then can you try a boring quiet cafe for ten minutes while you quickly neck a coffee. Build up slowly.
He needs enrichment and to be able to do doggy things. Walks should be off lead in enriching environments: beaches, woodland, long grass. Lots of sniffing (it tires their brains, reduces blood pressure and calms their pulse). Go to different places, different routes. Let him dig on a beach. He needs to do doggy things like sniff, dig, run, tear. You’re not trying to tire him physically but to tire him mentally.
Make food an enrichment activity. Puzzle feeders and snuffle mats are good (although I find long grass easier and cheaper in the summer). Ours likes tearing apart cardboard boxes to get to his food. Scatter feed so he has to sniff it out. When mine gets energetic mid-afternoon I sometimes throw small pieces of cheese around the garden for him to sniff out. Be unpredictable. Sometimes we go into the garden for training, sometimes to play tug or fetch, sometimes to feed him.
When he’s worked up you need to help him calm down. Licking stuffed kongs, lickimats and chewing help. Natural chews like pig/goat/buffalo ears, pizzles, tendons, ostrich bones are all good, and will give more sensory feedback than plastic chews so will help him settle. Licking and chewing help increase melatonin and will help him sleep.
Do formal training 2/3 times a day in 5-10 minute doses. And then everything he’s doing outside of that is also training, but more in an “ignore unwanted behaviour, reward things you want” way rather than formally interacting with him. Be boring so that he settles to sleep, but remember he will also need affection and closeness too.
Dogs and children are a toxic combination. Ours is much harder to manage when the kids are around. I think he sees them as puppies to play with. You just have to keep plugging away at it.
These are great resources. The Facebook group is very strict but that’s one of the main reasons why it’s so good and I can’t recommend it enough.
www.instagram.com/project.happydog?igsh=MTZyMHhvM3gydDJxNQ==
www.instagram.com/sarahsayspets?igsh=NHhxMXhkdTNrZHhk
https://www.facebook.com/groups/dogtrainingadviceandsupport
I hope some of that was helpful. Sending sympathy and lots of wishes for good luck!