If he is dehydrated you should go out and buy some UNFLAVORED PEDIALYTE and prepare a bath at a 10 to 1 ratio. So for every 10 ounces of Luke warm de-chlorinated water add 1 ounce UNFLAVORED PEDIALYTE. Make sure the bath is no deeper than half the height of the frog our up to its chin so it can't possibly drown. It must be UNFLAVORED PEDIALYTE which is clear and it should say unflavored on the bottle. Normally this bath is for 20 minutes, but I would leave him in for 20 minutes or more. This will provide electrolytes to assist in hydration and give him a boost.