If he just ate for you and drank thats a great sign. I would not worry about stressing him out with soaks right after he ate though. Id bump the humidity in the tub way up and give a few days to digest. Even though hes extremely thin, i also wouldnt jump straight to weekly feeding when his weakened system is used to monthly digestion. In his state, id go 10 days between the first couple meals. He does look like he could be a mojave but hard to say in that state. Good luck! Im glad you were abe to take on the poor thing and actually care about it. An emaciated dog in this condition would lead to an arrest.
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