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The best next tests to do would be xrays of Haandi's belly or even better, an ultrasound of his belly. This will allow your vet to check for tumors and see what his organs look like.
How long has Haandi had these symptoms?
Puppy food is fine as long as you are not seeing any stomach upset. It does contain more fat so we have to be careful giving it to dogs with sensitive stomachs.
It sounds like he is losing too much weight in a short period of time.
At Haandi's age, there can be many issues which could cause weight loss and polydipsia. I think the best thing for him at this point is imaging of his belly, especially since it sounds like he may be developing fluid in his belly.
Good luck with your sweet by Haandi!
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