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The yellow spots are from the nitrogen in dogs' urine. The only ways to prevent yellow spots are (1) make sure the dog's urine is diluted, either through drinking lots and lots of water or observing your dog when he pees and pouring water over the spot, or (2) getting a super-resistant and very fast growing grass like St. Augustine. With fast growing fescues, you'll still get the yellow spots, but the grass will regrow fast enough that they aren't permanent. Also, if you keep your lawn fertilized with lots of nitrogen, it renders it more susceptible to yellow or brown spots from the pee, as it's the additional nitrogen in the pee that causes the burning. Another solution is having enough space that your dog doesn't pee in the same spots all the time. Female dogs cause more brown spots because they pee closer to the ground, so it's more concentrated in a single spot.
It's a challenge, no matter what. Often we have to choose between having dogs and having beautiful lawns. It's hard to have both.