First of all... ~*hugs*~ to you and Disney.

My mom was faced with this at the start of the new year. Her Pom/Poodle Harley was about 12, was diabetic, blind, going deaf, having accidents, etc. She waited to long, when she finally decided to take her to the vet to have her put down, Harley went into seizures in the waiting room, and never recovered. She was gone only hours later.

It just would have been nice to have Harley go to the Bridge with out going through the seizures and the fear she felt going through them.

Disney will let you know when it's time to go... just make sure you hear her.