I was taking a bunch of shots last night of my dog playing with 3 other dogs. You really see the difference of fast glass vs slow glass when you shoot dogs running around. I'm thinking of getting the EF 28-135 mm f/3.5-5.6 IS(used my neighbors) because its around my price range but not until after my wedding. Now for my question. I noticed during some of the crazy running a lot of the shots were blurry and unusable but some of the shots were quite interesting and cool looking. The blurriness of the legs moving actually worked. Once I started predicting where they were going to be running the blurriness went away but I would like to purposesly do what I did on accident again. I can reword as well as provide samples if noone can think of what I'm talking about. Would the 28-135 prevent the need for predicting where the dogs would end up or should I get an even better lens.