I know we thought it rather odd too, as we've seen people in old folks homes etc with more than one dog.
I can't recall who the lady was now, it was Joanne (the wife!) who spoke to her at some function or other we were at, we'd filled in the paperwork and everything but after what we were told we decided we had best not put Libby forward for consideration.
I'll ask Joanne, see if she remembers the conversation she had with the PAT lady.