http://www.yorkietalk.com/forums/tra...og-ugodog.html
I use a grid system... here is the link where I discussed how to make one... It's really hard to buy one of the mentioned products in Canada, and personally I don't think it's worth it to spend that much money to have it shipped up here (I priced it all). I will try and remember to post some pictures of Harley's grid soon...