with a big heart passed away suddenly on Sunday morning . He was my buddy and constant companion . He suffered a series of seizures and was in terrible pain . I called the emergency number at our vets office and was directed to an animal hospital that was open 24 /7 . He was so very weak and didn't seem to know us and what was going on . The preliminary diagnosis was some kind of neurological problem , most likely a tumour . It would require a whole battery of tests , and likely with not a very good outcome when all was said and done . After a lot of tears I made the decision that the kindest thing would be to let him go . I think that given his age and how badly he was suffering, it was the right thing , but I 'm still having a difficult time dealing with it .