I lost Cody in January '05 and a good friend had lost her grey the previous November. They'd come in on the same haul from the same kennel.
I had NO sign from Cody - NO rainbows - but in September '05, I went to visit Vicki who now lived in FL. She picked me up at the airport, which happened to be 2 blocks or so from the GPA convention!! So - we both went in & went around the vendors, visited with other GTers, then left for Vicki's house. We weren't a 1/2 mile from the hotel when we both saw this HUGE rainbow!! (She hadn't had a sign from Chloe either...) I figure those 2 pups waited till we were both together to send their signs!!!