Read Calming Dog Signals by Turid Rugaas
Get to know your dog's body language right down to the very subtle signals
As others have said, be calm yourself. Don't use lots of voice commands; it's not necessary and it's like speaking Mandarin to them ie utterly confusing if you don't happem to speak it yourself! Dog communication is all about how you use your body , your posture and your arms and how you occupy space in relation to their space. And how and when you look directly at them (it's often polite to look away which is the opposite of us). learn about mirroring.
Turn your back, cross your arms across your chest and turn away every time they jump up. You have to be endlessly patient and consistent as does every member of the house.
Our dogs have been taught to sit in their beds away from us but in the adjacent room whenever we are sitting around the table eating or whenever the doorbell rings. It's a good idea ATM while he's young not to eat anything while sitting on the sofa so he gets a clear instruction.
Teach your dv to be very quiet and calm around him. They too must wait calmly by the door without looking at the dog when it's time to go out. Sometimes, leave them at home while you are training him and mix the schedule up.
Teach him to sit and wait before going anything. Before feeding, before going through a door, before going out in the garden. Get him looking at you and waiting for your command. Reward him when he looks at you. Then progress to getting him to sit and wait for your command while you are out walking together. Do it randomly after three steps and after five minutes and after thirteen minutes for example. Get him to sit and wait and you decide when you walk on. Do not proceed if he pulls but equally, don't constantly pull on the lead, the training is in the release. So loose lead, walk along calmly, quick tug to stop, and immediately stop tugging and release when he does.
Only stroke him and pay him attention when he is calm and settled. Don't give him lots of stressed attention (like shouting at him) when he misbehaves as it will reinforce the problem.
Get a Perfect Fit harness for your lad and let him wear it around the house at all times (they are soft fleece so they are comfortable). That way, when you take him out, you only have to clip the lead on and there is far less palaver. He is reading your rituals and signals and those of your DC prior to going out and winding himself up so you have to break that association. With the harness on at home you can quickly clip the lead on and take him out at odd unexpected moments throughput the day. Maybe ten times in an afternoon for five minutes but very, very calmly and quietly. Do not walk him at the same time every day. Only clip the lead on when he is calm and sitting down. It obviously helps if you have taught him to sit first!
He sounds very high energy and of course he is very young so please persist in getting some help from a good trainer one to one. The teeth snapping needs to stop before it develops in to anything worse. Good luck!