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I am sorry to read about your dog's illness. from a legal point of view though, to report the kennel or do anything about it, you would need to have proof of abuse. Only your vet may find out what the dog suffers from. And from there, one might be able to find out if the kennel's responsibility is at stake or not.
The only objective fault outlined in your message would have been not to inform you that they did not have enough food to feed the dog. And I understand that it was because you did not leave enough. You cannot blame them for not feeding him any substitute: if they had done so and it had made the dog sick, you could have blamed them and sued them.
I am indeed sorry I could not bring you better news. Please do not forget to rate my answer.
I hope your hound gets better soon.