Water-it sounds easy but it is truly the best thing you can do right now. Put lots of water on the dog spots by running your garden hose in those areas to dilute the urine. The acid or nitrogen in the urine is burning the grass. You can also apply garden lime to the dog spots to neutralize the acidity. Garden lime works great but it’s slow to break down and can take a whole season before you will see significant improvement. The fertilizer program will also help by encouraging the grass to grow in those spots and if the lawn is at least 3 years old, deep core aeration will also help by getting more water to penetrate those areas. We would also suggest over-seeding after aeration. There is also a herbal supplement that your vet can recommend which will neutralize the pH of the urine.