> just out of interest how do you clean the inside of the treat toys?
Kongs can go on the top shelf of the dishwasher or leave them to soak first and then clean with the sort of brush designed for bird feeders. If you have other things with tricky corners; fill them with rice and soapy water then shake vigorously (remember to tape or hold your hands over the holes!)
I used to freeze my Kongs too which helps to take care of bacteria. Freezing the contents meant that it took longer for my boy to get the stuffing out and it helped with teething. Someone on here recently suggested giving puppies freezing damp knotted teatowels - I wish I'd known about that before as I think my dog would have loved those.
Keep a box full of suitable chew toys and rotate them to keep your chap interested or let him choose his own from the box. You can teach him to drop his old ones in the 'dirty box' and take one from the 'clean box'. I was never very successful at that bit but I have a friend who could ask her bitch to tidy up!! If you ever catch him in full chewing action on something unsuitable use a fresh chew to distract him and perhaps teach him that chewing only happens in one place. I would let mine chew in his crate, in the kitchen and in the hall but he was never allowed to take toys into the living room. I would open and close the baby gate to help him understand; each time he picked up his toy to come in I'd shut the gate til he dropped it - it took him just a couple of days to work that one out. If he ever managed to sneak one in I'd remove it and him til he was ready to leave it in the hall. I keep the lounge as invitation only and for snuggling and sleeping. No toys, no games, no training exercises, no mucking about!! Ooh matron - you are strict

but it does make for a calm life in there.