[Twelearly]

I think it's great that you are doing research BEFORE adopting

I would say, yes, there is a good chance dog aggression could be come an issue later. All dogs can become cat aggressive, even after years of peacefully coexisting, my advice is to not leave them together unsupervised. I do not recommend allowing a child to hold the leash, there's too much that can go wrong.

http://www.pbrc.net/breedinfo.html
http://www.pbrc.net/multidogs.html
http://www.pbrc.net/training_cat_dog.html
http://www.pbrc.net/toddlers.html