I think you're right, @frontrank2. I recall reading that Lincoln never did visit Springfield, and Fido continued to live with the Rolls. Here's a little summary I wrote about Lincoln and Fido:I believe the last time he would see his faithful dog. I don't think he ever visited Springfield for the rest of his life. And I doubt Fido made it to D.C.
Lincoln's Springfield barber, William de Fleurville, wrote the President a letter that mentioned Fido, asking Lincoln to let Willie and Tad know that their dog was doing well. After Lincoln was assassinated, as Springfield prepared for his funeral and burial, a member of the Roll family took Fido to the Lincoln home to greet the crowds of people who had gathered there. Sadly, Fido met his own fate a short time later, when he was stabbed by a local man. There is some speculation that the stabbing might have been accidental, according to a newspaper article referenced in a popular CivilWarTalk thread about Fido.