I feel for you, it’s awful when your best mate leaves you. We lost our beagle a couple of years ago after he was diagnosed with a brain tumour. It all happened so quickly. We swore we wouldn’t get another dog ( we have worn out 6 now!) but last year we adopted another. She’s a very fit 11, life expectancy of her breed is 12-13, so we are making the best of our lives together for as long as we can and not thinking about the future.