Fix brown spots?

This link will explain:

https://www.sublawn.com/keep-your-lawn-green-with-a-dash-of-epsom-salt/

Soak urine stains with water. After the dog urinates, add a few cups of water on that spot, to dilute urine.

Teach the dog to urinate in other places. This approach is very effective for owners who do not want to add supplements to their dog`s food.

Replant your lawn using urine-resistant grass. The most resistant are the perennial ryegrass and fescue; on the other hand, you should avoid Kentucky bluegrass and Bermuda, as they are more ...

Apply a special treatment to the lawn, which fixes and neutralizes the nitrogen.

Do not stress the lawn with too much or too little fertilizer and water it as often as possible.

Be VERY careful as to what you add to the lawn. Diluting it is the best case solution. I have a garden hose by the back door. Just give the grass a spray after you dog goes.

Here is some more help:

https://diygarden.co.uk/lawn-care/how-to-make-your-grass-greener-with-epsom-salts/

Are the brown spots from dog urine? or are they from a fungus or grubs? Dog urine is the easiest fix, because you can just use your hose and some Miracle grow. If it is from a fungus or grubs Extremely rainy or humid weather can encourage fungal outbreaks, as can lack of sunlight and poor air circulation. Although you can’t control the weather, there is something you can do to protect against fungus Use some Scotts disease control. If from grubs, use a bug control on the yard.

Epson salt will not fix brown spots. The grass is dead. Epsom salt will revitalize grass and make it greener. To fix brown spots.....

Restoring grass to bare spots on your lawn caused by dog urine, piles of leaves or objects remaining on the grass too long can best be accomplished by overseeding. Here are a few steps to ensure the best results for your efforts.

Start by raking away the leaves, dead grass or thatch to expose bare soil wherever the turf has completely died. Grass seeds need to be in contact with earth before they will grow.

Overseed the spots with grass seed and rake lightly to put the seed in direct contact with the soil.

Apply more soil on top. Spreading it out until it is about 1/4-inch thick.

Give the newly-seed area a good watering with a sprinkler and continue watering daily until the new grass is established.

https://www.hometalk.com/diy/grow/fix-burnt-grass-dog-urine-spots-with-this-easy-solution-31084976

Hello, If you add a little to water in can you will help neutralise it.

I would try this: https://www.hometalk.com/search/posts?filter=burnt%20grass

Hello. Here’s a link that could be helpful. If the grass is dead you’re only solution would be to remove and reseed or buy sod

https://www.hometalk.com/diy/grow/q-how-do-i-apply-epsom-salts-to-green-up-my-lawn-43429082

No epsomsalts use grass seed in spots Eason salts will kill the grass