Found a ??homeless?? dog? What should I do?

[Force1]

When I went to take my own dog for a walk yesterday I saw a little tiny dog covering and whimpering in the corner. I checked on the dog to make sure he was alright which he appeared to be fine.

I can't tell if this dog is homeless or not. It has not collar, its nails are extremely long, but it smells like it has just been washed. I let the dog in the house and now don't know what to do with it.

To further complicate the situation I am moving out of the apartment bulding where I found the dog today. I am going to print up some flyers and post them at the old apartment but if no ones comes forward what should I do?

I am moving into a house that already has 2 dogs so keeping the dog is definetly an option but I don't want to take someoene else's dog away if they are looking for it.