Fixing dog urine spots on the lawn

What actually causes the brown spots?

Dog urine is high in nitrogen and dissolved salts. Nitrogen is a fertiliser, which is why the grass around the edge of a spot often looks greener than the rest of the lawn. In the middle, though, the dose lands all at once in a palm-sized area, and the salt pulls moisture out of the grass roots faster than they can take it up. The result looks like a burn, because in effect it is one.

Three things make it worse. A dry lawn, because there is no soil moisture to dilute the dose. Short mowing, because shallow roots have less to fall back on. And a dog with a favourite spot, because the same patch cops it twice a day.

Female dogs get the blame more often, but that is about squatting in one place rather than marking along a fence line, not anything about the urine itself.

Why is the ring green and the middle dead?

It is the same nutrient at two different doses. At the diluted outer edge, the nitrogen acts like a feed. At the concentrated centre, it acts like a burn. You are looking at a very small, very fast demonstration of why liquid fertiliser labels bother to specify a rate at all.

It is also a useful hint. A lawn that shows dramatic green rings is usually a hungry lawn. If every spot in your yard is ringed in dark green, the rest of the lawn is telling you it would like some nitrogen too. Our greener lawn guide covers the baseline routine.

How do I repair a urine spot, step by step?

Step	What to do	Why
1. Flush	Tip 5 to 10 L of water over the spot, ideally within an hour	Dilutes the salts and nitrogen before roots are damaged
2. Rake	Scratch out the dead thatch with a hand rake	Lets light and air reach the soil so runners can cross it
3. Water deeply	A good soak twice over the following week	Leaches remaining salt below the root zone
4. Feed the surrounds	Medigrow at 2.5 mL per litre, every 1 to 2 weeks	Pushes the healthy grass to spread sideways into the gap
5. Plug if needed	If the bare centre is bigger than a saucer, drop in a turf plug	Gives the repair a head start in the middle

Skip the step most people start with, which is tipping fertiliser directly onto the brown patch. That area has already had too much nitrogen. Feed the living grass around it instead and let it do the work. The same logic applies to any bare spot, which we go through in how to fix a patchy lawn.

How do I stop new spots appearing?

You cannot change the chemistry, so change the pattern. Train the dog towards one mulched or gravelled corner of the yard and reward them for using it, and that corner takes the hit instead of the lawn. A watering can left by the back door makes the flush habit realistic, because a spot you rinse within the hour rarely browns at all.

Beyond that, a thick, well-fed, longer-mown lawn simply shrugs off more. Deeper roots, more soil moisture and faster sideways growth mean a spot closes over before you get around to noticing it. Feeding every 1 to 2 weeks in the growing season, and matching the feed to your grass type, does more for urine resistance than any single product aimed at the problem.

One thing we will not do is tell you to change your dog's diet or add anything to their water. That is a conversation for your vet, not a fertiliser company.

Is it safe to feed the lawn with the dog around?

Medigrow is mineral-based, with no blood and bone, fish meal or manure, so there is no food smell to attract pets to the lawn after you feed. It is safe around kids and pets when used as directed. Let the foliage dry after spraying before the dog is back out on it, which usually means an hour or two on a mild day. There is more detail in our guide to pet-safe fertiliser in Australia.

Mixing is the same for lawns as for everything else, 2.5 mL per litre, about 22 mL for a full 9 L watering can. Made and shipped in Australia, free shipping over $149, and backed by our 30-Day Growers Guarantee.

Common questions

Does lime or gypsum fix dog urine spots?

Not really. Lime changes soil pH, and dog urine damage is a salt and nitrogen concentration problem rather than a pH one. Water is the cheaper and more effective answer. If your lawn has genuine pH issues, that is worth a soil test and a chat with your local nursery.

How long until the grass grows back?

In warm weather with regular feeding, 3 to 6 weeks for a spot the size of your palm. In the cooler months, warm season grasses sit still, so a spot made in June may not close until the soil warms up in spring.

Will the green rings even out?

Yes, once the rest of the lawn catches up. The rings look dramatic only because they are darker than the grass around them. Feed the whole lawn on a fortnightly rhythm and the contrast fades within a couple of cycles.