Hope every thing works out well for you , I know exactly how you are feeling mate.
My two dogs are my children to me and they have cost me a fortune over the years as have all my previous dogs but worth every penny in the joy they bring.
What we do is 2 smaller meals a day and only walk before a meal not after. It reduces the risks of twisted gut or bloat in dogs, certain breeds are just prone to it though.
Too much close breeding in pedigrees nowadays which doesn't help .
All the best to you .