Some dogs urine is just more acidy than others. Yes they do make products for this but I do not reccomend any that have to be ingested by the dog as it distrupts the acid levels & may cause health problems like UTI's, bladder infections, kidney infections, stones & crystals even cancers. They make products to be used directly on the lawn, I have tried a couple different brands but no luck. My favoite trick for this problem & safest is to just water that area down very well after he urinates.