All this biting is very normal and a developmental stage pups need to go through. This is how puppies play and interact with their world, and use their mouth as they have no hands. They outgrow the land-shark phase around six months of age - so it takes a while.
The BEST way to deal with this is to give your puppy lots of exercise
, and to redirect
always. A tired puppy is a good puppy!
(Sing this Mantra everday, it will direct your aim and goals for the pup for the day, and save your sanity). Some pups get over-tired and like toddlers, act up and have little bitey tantrums. They are too young to be able to discipline themselves to stop and sleep if tired, so when you see that despite tons of play, fetch, tug, and on and off leash walks and outdoor hikes you have a little wound-up Tasmanian Devil, then it is time to crate and let the pup have a nap. It is actually a good idea to work nap-time into their regular schedule.
For redirecting, you have to do this a bazillion times a day. Soft, tuggy toys work better for this, and don't just stuff the toy in the pup's mouth, that is boring, pup will drop toy and come after you for more interactive play - so stuff toy in pup's mouth and PLAY!! Tug with him! Let pup win! Let him know that he is the BEST puppy in the whole world! That
is a game they will want to play over and over again, and just it to your advantage. Playing by chasing, grabbing, tugging, are strong survival skills that the pup is practicing as play behaviour, and being such basic survival instincts, it does not get re-programmed over-night, so patience!!!
Enjoy the pup, eventually, it does get better.