I don't want to get too far off topic...fostering is a great thing. Go for it. I wouldn't consider it less of a commitment though. And as for training, everyone has different ideas. But all dogs are different too. Cesar has an amazing website that goes far beyond the tv shows. Google any question you have and you will find a pretty good answer there.
As for puppy biting, definitely don't replace your arm or the couch or anything he's biting with a toy. Toys are rewards for good behavior. I think the key to puppy biting is partly realizing they're puppies and that's what they do. But more importantly teaching your puppy a few skills. Puppies are more than capable of brain work. If you can master a couple of easy commands early on, like sit, lay down, come, you have some great ammunition for stopping the chomp. My two had those down by 12 weeks. Once they sit and stop biting for 20 seconds, or complete two different commands, then you give them the toy. Engaging their brain will automatically stop unwanted behavior. The other thing is learning when they like to bite...after eating, first thing in the morning, evening etc. Just like house training you can anticipate the onslaught and redirect them before it happens. Brain games are great...find the toy, follow the scent, etc. And even more important, tired dogs don't bite. Some breeds can handle an extraordinary amount of exercise. Depends on your breed though. And if possible, play with other puppies will help with socialization, proper biting, and exercise. More time with mom is also a huge benefit. Tired moms don't play that.
And parvo is back...again....
http://globalnews.ca/news/3413440/pu...-alberta-spca/