I have a staffie puppy who is between 6 and 7 months old.  I have had a problem with him from the beginning with play biting and at first my arms and hands sometimes looked as though I had been self harming where his milk teeth were so sharp. He is very intelligent and I have taken him to puppy classes, he knows all his commands and has 100% recall. In short, the biting improved greatly about a six weeks ago and when I said "off" he would stop, then when he reached 6 months of age (2 weeks ago) he started doing it again with a vengeance.  He's again started biting feet, hanging off trouser legs and coats, pulling my sleeve and so on.  Their is absolutely no aggression involved, but hes a big strong boy now and I just cannot get him to stop it.  Any "ouch" or walking away or giving him time out makes no difference.  In fact saying ouch when he was little, only excited him more. When I tell him off he looks at me as if to say "am I bothered". He has plenty of play and excercise and is never left alone and at others time hes very loving.  This is my 5th staffie and none of my previous dogs behaved this way, their chewing was more directed at my furniture!!   He never tires or takes a nap, and the only thing I have changed was reducing his meals down to 2 meals a day at 6 months as I was advised to do.  He has JWB and I also feed him marrowbones and stuffed kongs etc.  Any advice most welcome and much appreciated.

I wouldn't expect this stage to be over until she has all her teeth settled into her jaws at around 9 months, but staffs stay very mouthy anyway, so only training will get them to temper their enthusiasm for this.

They really are heavy duty chewers and tuggers as a breed.

If this behaviour coincides with the change in the number of meals, why not go back to smaller more frequent meals for a couple of weeks and see whether that helps, too.
Some dogs might take a bit longer to mature than others maybe he's not quite ready for that change yet.

>>>He never tires or takes a nap,<<<<

How much exercise he getting every day?

Hi Kathleen,
Your chat of your boy reminds me so much of my EBT when a young lad-feisty little tykes at times! :-)
I would suggest getting him into a tennis ball or squeaky toy only for a play with on special occasions- it keeps them keen on that toy and just try and get him focused on that rather than your arm/hand/leg! If he does end up grabbing that rather than you- after a while get him to sit and give him a sweet.
Remember even though this boy is your 5th staff they all can have very different temperaments- I expect his Mum or Dad were hyper. Learning fetch will be a help in burning off that high play drive.  

Thank you for your replies.  I have put him back to 3 meals a day from today to see if it will make any difference.  He has regular exercise, 3 good 3/4 hour walks per day, and I have a large garden and paddock for him to play in too, though to be honest the weather has been so awful.  In fact hes the first staffie I have had that would go out in the rain. lol!  I was advised not to walk him more than 5 minutes per month of age but he definately needs more. I have also wondered whether its his testosterone kicking in?   I'm also most concerned that because he spends a great deal of time with just me, that when we do have visitors he literally mugs them and it can be quite frightening to have a vigorous young staffie greeting and nipping and hanging off you, so I really need to halt it now.  Any staffie owner will know that they can jump incredible high too.

During the daytime when he is alone with me he is fairly well behaved, but Evenings are the worst time of all with him, so if I want to sit and watch tv i usually give him a bone then to get a bit of peace. 

Another question is about bones,  I give marrowbones which he loves and whilst hes chewing that I can get a few things done, but the knawing on the bone seems to make him want to bite at me more straight afterwards, and at this time he can put too much pressure in to his bite.

To sum up I suppose he is attention seeking and using biting and pulling to get constant attention which of course is impossible.

Again, all help and advice much appreciated.

He does seem to have quite alot of long walks, it is surprising he doesn't relax and go to sleep. Maybe he is over-tired?
Perhaps his walks could have some training breaks within them so he is only walking/running for 30 minutes but with about 3 5 minute training sessions at various places along the way.