Sounds like hypoglycaemia (sp?) which is low blood sugar. I would also get bloods done to check all ok inside, did vet check heart?
For low blood sugar go back to 2 feeds a day. You won't want to feed a large amount if dog is going hunting or running in the early am, but you can take along a cheese and honey sandwich, or doggy power bar if you can get them here, to keep dogs engine running.
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