She suddenly couldn’t walk/use her back legs and was crying as I was going to bed. Took her to the emergency vet and she said it was a clot. She had no feeling in her back legs at all and was losing it in one of her front legs. Very poor prognosis so the decision was made to PTS. She was 10. It’s a year ago tomorrow since my 10 year old dog was PTS after his lymphoma got the better of him. Heartbroken doesn’t even come close.