How do I repair grass from dog urine
Here's a good tutorial from Hometalk on repairing urine spots in grass: https://www.hometalk.com/31084976/fix-burnt-grass-dog-urine-spots-with-this-easy-solution
Scratch the surface and remove any dead debris. Sprinkle some good soil on the spot. Reseed, keep watered and it will grow.
Rinse the area very well and as soon as possible, if the grass is dead, rake it until about 1/2-1" deep is removed. Re-seed and water. Better yet, take your dog for a walk so it does not pee on the lawn.
spray it with beer
The best and easiest way is to to keep watering the areas until the acid from the urine is neutralized.