Well Jack apparently peed on her bedroom floor this morning at about 5:30 am. She had finally made an appt at the vet's for 4:30 this afternoon. Phew! I was beginning to think I would have to kidnap him and take him myself.
mruffruff, are there any other symptoms or warning signs of diabetes besides the excessive drinking and urinating that you could tell me about?
Jack doesn't appear to have any other problems or to be acting strange at all. He did lie down a few times unexpectedly on our morning walk yesterday but he had been swimming the day before and I just figured he was tired from that.

Thanks for the help and the good wishes. I will let you know how the vet visit goes.