Just went through the same thing, I also had an old family red "purple ribbon". Back In the first week of May, He was fine then all of all of a sudden bam he would not eat , poor guy would throw up evrything even water. So I brought him to the Vet, The vet did some blood work and said and did not look good, so he suggested to run some more tests, anyway he had cancer all over his body in his lungs stomach etc, I had this dog for 12yrs and man he went to the vet at least three time a year if n\not more. Anytime he was sick I brought him.I totasly blam eth evet for this mess he should of picked up on this early but this asshole try to say he was fine last times he came in, The vet dropped the ball and fuck him, I had to put him down and it was the hardest thing i have ever done. Its about how he lived and not about how he died!! His name was Vince and I loved him like he was my brother.. Sorry for the ramblin just thought I'd share a little. R.I.P. Vince