The fact that you have a baby sister should not prevent you from adopting. Most shelters (at least all the shelters I have seen) put their dogs through some sort of personality test to see what kind of home the dog would be the safest in. Before I adopted my pug I went to the Michigan Humane Society and looked around for a dog that's great with kids...I ended up falling in love with this GSD/Rot mix who was WONDERFUL with kids! She plopped down and exposed her big belly in hopes that someone may want to rub it.

I had about 150 dogs to choose from that were said to be good with kids. I can honestly tell you that I bet most or all of those beautiful dogs that I looked at are now dead because no one wanted them. Please think about adopting. Talk to the shelters and see what they think. I even saw some purebred golden ret. and labs at the shelter. Those are usually GREAT breeds for a family with young kids. If you have your heart set on a purebred and only a purebred, find a breed that most fits your lifestyle (think carefully, this is a HUGE decesion) and look on the web for a rescue of that breed. I bet you will get dozens of hits! They have a rescue for just about every breed you could ever want.