I've thought about one of the water fountains,that the links have been posted for, but Earnhardt needs something deeper,he makes a huge mess when he drinks,I am afraid I would be cleaning up more water than I do now,if it was inside the house.
They have 'big dog' versions of the water fountains as well, they might be more suited to Earnhardt.
Out of curiosity when did you name Earnhardt? My father had a beagle he named Forever Dale when Earnhardt died. Unfortunately Dale died 2 years later due to kidney failure from Lime Disease.
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. As to letting him stay in the house while I am at work
he would demolish the place. He likes to be out and playing. The neighbor reaches over the fence and pets him and Mom comes by and says hi sometimes (they are only a mile away). Maybe this is the incentive to build a sun room