if i choose a rescue dog, will the dog respond eventually to a different name. e.g. my brother adopted a lurcher called brian and kept his name. it is so funny to watch when hes called. do you think an older dog would respond to a name change.
If possible, you could try to think of a name that sounds like the one the dog already has. I know someone who rescued a dog called Missy and renamed her Lizzie. Though I don't know how many names have similar sounding ones...