What's up with JJ? Someone said on FB it's a hamstring.
Article on the website says that it's hamstring tightness and that he'll miss again this week, but should be available the week after.
On the plus side, it seems like Stringer, Bob, Roughy and Fletch will all be available for selection.
Source: http://www.westernbulldogs.com.au/news/2015-08-10/stringer-safe-dogs-unscathed