Hmmm. Well kinda. The urine is N. Turf will use all the N available until it reaches a wall, either a limiting nutrient (special warning here- but I'd need to check to verify particulars about substitution--which can seriously affect turf health) or until it reaches maximum growth potential. At that point, adding more N (urine) wont make a difference and no change in appearance from the additional N due to urine. Pushing with N (even if no limiting nutrient) can create problems as all the succulent new grass is an open invite to insects and disease.

For most people dog spots seems to kill the grass. What they need to do is stimulate the reproduction of beneficial soil microbes by adding sugar to the soil. Your soil apparently has sufficient microbes to process the urine and the plants are taking it up.

Urine is an organic fertilizer. You might apply another organic, like soybean meal, alfalfa pellets (rabbit chow) or meal, corn meal, or corn gluten meal...or Milorganite. This will even out the amount of fertility and should even out the green color. I'd wait a couple weeks to apply the first fertilizer of the season. End of May is a good time.

Teach your dog to urinate in one place.

mdstamen has the long term solution. I now get my pets from the animal shelter which means they are at least sort of house broken - not up to new learning. But if you get a puppy and have to house break it yourself, and you use a paper on a tray system, you can get the dog to pee/poop in the location of your choice by moving it to that location. My first dogs raised from puppyhood were trained to use the ivy as a bathroom. That was GREAT!

I like your reply. Now, can the dog tell the difference between Boston and Poison Ivy?

So instead of fixing why my grass isn't as green as it could be, just fix the dog urinating on the grass?

You know I read this wrong. You are saying the urine from the dog makes the grass greener? You need to patent that dogs urine! Dog urine kills grass!

Maybe save his pee and resell it!

Your grass is probably seeking nutrients. Mammal urine is also known as Urea, a potent nirtogen fertilizer which informally turns spots brown on lawns.

Urine only appears to kill grass. What happens is the microbes that usually take care of grass are overloaded with nutrients from the urine. If you can overpopulate the microbes in that area, then the grass will return and become greener. You can do the same thing with blood meal.

Ok. So if the area where my dog is urinating turns green so I may need to supplement my lawn with some urea??

Its been a multi-year process. The first you could see the ground and the grass would go dormant in late June / July. Last year it was dormant for about two week in August.

I would go go with corn meal or another supplement but by total nutrient volume I find Milorganite to be the cheapest.

While supplementation with any fast nitrogen source would work (whether it's urea, an ammonium or nitrate source, doesn't really matter), it could come at a cost.

Better fed lawns will respond to still more nitrogen arriving in the dog urine by burning (that tendency will also increase as temperatures rise and the soil gets a bit drier).

You may need to step up the amount (or frequency, depending on your schedule) of feeding you're currently using for best results, but you'd have to let us know what that is.

So the lawn covers about 18,000 sq ft. I put down four bags of Milorganite every month starting in May and continuing into Oct. In addition, I use Menards Premium Second Application (15k sqft) at the end of May, and July. Winterizer at the end of Sept. I mulch all grass clippings. I keep my grass height at about 3".

In in total it's about 4lb nitrogen per 1000sqft per year in fertilizer.

Original grass seemed to be a mix of fescue and crab. I've overseeded with midnight kbg the past two falls.