Thanks again everyone. I am really sad about the dog because I got very attached to the little guy. However, I believe I made the right decision. Plus I was told by a couple of animal experts locally that I also made the right decision.
The good news is that I learned a great deal from this experience -- not only what to
avoid in a dog, but what to look for as well.
I am still keeping the appointment with the service dog organization tomorrow. The organization suggested that, at no cost to me, even though I had decided to not take the dog and have him evaluated (which I would have had to pay for and in which they would have made some money). So I will get a chance to learn more about what kind of dog to look for regarding my own individual needs.
Thanks again for all your help. This is one of the nicest forums of the most helpful people I have ever been on!