i have a 2 year old springer spaniel who is left for up to 8 hours a day, i walk her in the morning for about 30 mins then play on the green with a frisbee for a further 15 mins. by the time we get home she is shattered, she is also walked for around an hour every evening. i leave her with a pigs ear and chews daily and buy her rawhide bones and roasted knuckle bones which i replace when she has knawed them to death. she also has next to her bed a toy box which contains around 35 toys ( at last count ), she rumages through this daily and takes out whatever she likes, she has a variety of toys but particularly likes soft toys which i buy from carboots. she pulls out the stuffing and pulls out them to pieces but i have never had a problem with her chewing ( even as a pup ) as she has always known what is hers and what is not, they like to be and need to be given the same bounderies you would give a child. she did use to dig up my plants and dig holes in the garden but i managed to stop that by fencing off the patio area with stakes and chicken wire and giving her free run of the patio, i also had put in a dog door so that she has full access to the house but can go out whenever she chooses, i hope this helps, good luck i know it can be very frustrating.