My bad and that vet must have needed business. I just googled up "dog health +tomato juice" and there were several cautionary articles about altering a dog's pH output and possibly causing bladder infections, stones, etc. A more enviromentally friendly approach was to water the area and then sprinkle about a tablespoon of sugar over the area to feed the soil microbes. LSA
Heh... it sounded like a lot of work anyhow :~)
Our across the street neighbor's puppy used to get out and sprinkle our yard. She must have gotten four different places, because that's how many yellow spots we had. I just kept watering the areas, and now they're growing grass again.