Keyword Link Spy is a free tool that will allow users to find the backlinks that your top 100 competitors are using to rank for specific keywords. Simply enter your keyword such as "dog training" and Keyword Link Spy will show you all the backlinks linking to the organic results for "dog training".
This tool is great for getting an overall view of what type of links your competitors are using to rank. Assessing the competition is key to ranking. You can also see where your competitors are obtaining their backlinks are replicate this strategy.
Here is something I just have to share with you guys. SEMRush are giving away a free 7 day trial of their truly amazing SEO tool.
I highly recommend trying out their free trial. Here are just some of the awesome capabilities of this service.