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A quick search online may recommend that you give your dog apple cider vinegar to help decrease the pH level of your dog’s urine. This method won’t help your yard, though. Most turf grasses thrive on slightly acidic soil, so apple cider vinegar won’t make much of a difference. 

The main cause of grass death by dog urine isn’t the pH level anyway—it’s usually the excessive amount of nitrogen that kills your grass.

Technically, yes—and you may have some successful growth—but this isn’t the ideal way to fill in sparse areas. By clearing leaves and debris, amending the soil, and aerating it properly before you lay the seeds, you’re providing the most ideal conditions for them to germinate.

The quickest way to kill weeds is to burn them, pour boiling water on them, or pull them out by hand. Each of these methods works instantaneously. Beyond that, using vinegar for grass works in a couple of hours, as do herbicides you can buy at the store. The slowest way to kill weeds is to starve them of nutrients and sunlight with mulch or fabric covers.

If the grass is dead, you cannot bring it back to life. However, you can grow new grass in its place or try the methods mentioned above to revive the grass if it isn’t entirely dead. You can expect St. Augustine grass to come back after moderate droughts, but it will suffer significant nutrient loss after an extended period of drought.