--- title: "What Infill Works Best for Dogs? | TIMELESS Grass & Greens" description: "Choose pet-turf infill as part of the complete system. Check product compatibility, material requirements, cleaning, heat and the evidence behind odor claims." url: https://www.timelessgrass.com/blog/what-infill-works-best-for-dogs/ updated: 2026-09-11 --- Pets # How should you choose infill for a dog run? * * * Updated 2026-09-11 The short answer ## How should you choose infill for a dog run? Choose the infill specified for the turf, the dog run’s use and applicable material requirements. Compare its care instructions and documentation rather than assuming one ingredient is best for every yard. Odor-control claims do not replace waste pickup, cleaning, drainage or a plan for hot conditions. Planning a turf installation? Get a layout, turf options and a written quote for your space. [Request a free estimate](https://www.timelessgrass.com/estimate/?use=Pet%20turf) [Call 303-349-2368](tel:3033492368) We’ll call to arrange a free site visit. On this page On this page 1. [What infill does in a dog run](https://www.timelessgrass.com/blog/what-infill-works-best-for-dogs/#what-infill-does-in-a-dog-run) 2. [The options at a glance](https://www.timelessgrass.com/blog/what-infill-works-best-for-dogs/#the-options-at-a-glance) 3. [Smell: where zeolite earns its place](https://www.timelessgrass.com/blog/what-infill-works-best-for-dogs/#smell-where-zeolite-earns-its-place) 4. [Heat: the rubbers aren’t equal, and shade beats them all](https://www.timelessgrass.com/blog/what-infill-works-best-for-dogs/#heat-the-rubbers-arent-equal-and-shade-beats-them-all) 5. [Germs: sand holds on longest](https://www.timelessgrass.com/blog/what-infill-works-best-for-dogs/#germs-sand-holds-on-longest) 6. [Heavy rain: heavy infill stays, rubber floats](https://www.timelessgrass.com/blog/what-infill-works-best-for-dogs/#heavy-rain-heavy-infill-stays-rubber-floats) 7. [Infill wears down, whatever you choose](https://www.timelessgrass.com/blog/what-infill-works-best-for-dogs/#infill-wears-down-whatever-you-choose) 8. [Florida decides part of it for you](https://www.timelessgrass.com/blog/what-infill-works-best-for-dogs/#florida-decides-part-of-it-for-you) 9. [Choosing for your dog](https://www.timelessgrass.com/blog/what-infill-works-best-for-dogs/#choosing-for-your-dog) ## What infill does in a dog run Infill is the loose layer that sits between the blades. It holds the fibers upright, adds cushion and helps water drain, as New Jersey’s environment department describes it. Some systems use little or none, mostly in low-traffic landscapes. A dog run asks infill to do four more jobs: - keep smell down, - stay comfortable for paws in the sun, - avoid holding on to germs, - and stay put when a summer storm comes through. No single material wins all four. The right choice is the one that fixes the problem you have. ## The options at a glance - **Silica sand.** Natural and heavy. It’s one of the infills Florida allows in single-family yards, and it held MRSA longest in a lab study. - **Coated sand.** Sand with a coating. Florida allows it where the coating is non-toxic. - **Zeolite.** A natural mineral that takes up ammonium, sold as an odor-control infill. - **Crumb rubber (SBR).** Shredded tires. It ran hottest of the rubbers in the heat studies, and it floats. - **TPE and EPDM rubber.** Synthetic rubbers. TPE ran cooler than crumb rubber, and MRSA lost viability fastest on EPDM in the lab. - **Cork, coconut fiber and walnut shell.** Organic infills the New Jersey study lists as alternatives to rubber. - **No infill.** Some pet systems go without it. Then the backing and the anchored edges do the holding. ## Smell: where zeolite earns its place Zeolites are natural minerals valued for their “adsorption, ion-exchange” properties, and pet litter is one of their main uses, according to the U.S. Geological Survey. A common natural zeolite, clinoptilolite, takes up ammonium, the dissolved form of the ammonia you smell, by swapping it for the sodium, potassium and calcium it already holds ([Wasielewski et al., 2020](https://pmc.ncbi.nlm.nih.gov/articles/PMC7796350/)). It has a limit. In that 2020 lab study, the zeolite held at most about 15 to 16 milligrams of ammonium per gram. So it buys you margin, not a pass on rinsing. The chemistry behind the smell, and the care and drainage questions to check, are in [why turf smells like dog pee](https://www.timelessgrass.com/blog/why-does-artificial-turf-smell-like-dog-pee/). ## Heat: the rubbers aren’t equal, and shade beats them all Infill changes surface temperature a little. In two studies collected by a [2024 analysis of 23 studies](https://pmc.ncbi.nlm.nih.gov/articles/PMC11272752/), crumb rubber ran hotter than TPE rubber: 53.5°C against 45.6°C in one, and 61.2°C against 58.0°C in the other. A sand and organic infill plot measured 48.1°C, though that was a separate test, not a side-by-side comparison. Shade matters much more. In the same analysis, synthetic grass averaged 57.5°C (135°F) in sun and 32.2°C (90°F) in shade. For a dog, where the run goes matters more than what fills it. Put it where the afternoon shade falls, and keep a water bowl there. ## Germs: sand holds on longest A [2020 lab study in Sports Health](https://pmc.ncbi.nlm.nih.gov/articles/PMC7222665/) measured how long MRSA stayed viable in different infills. Time to lose half its viability: - **EPDM rubber:** 2 hours - **Cork-based:** 7 hours - **Polymer-coated:** 9 hours - **Crumb rubber:** 12 hours - **TPE rubber:** 13 hours - **Sand:** 27 hours MRSA could still be recovered from infill after up to 96 hours. None of this makes sand a bad choice. It means a sand-filled dog run needs a regular rinse, and a busy one, like a boarding yard or a daycare, needs a written sanitizing routine. ## Heavy rain: heavy infill stays, rubber floats This matters on the coast. Rubber pellets “are buoyant and may wash away,” the New Jersey study warns, and it advises high-density infills, such as coated sand and zeolite-based infill, where heavy rain is common. [UF/IFAS Extension](https://blogs.ifas.ufl.edu/global/2025/07/15/considering-synthetic-turf-what-homeowners-should-know-before-installation/) adds that runoff from turf can carry heavy metals and other pollutants, “especially when rubber infill is used.” In Jacksonville, normal rainfall from June through September adds up to roughly 28.8 inches ([NOAA climate normals](https://www.ncei.noaa.gov/access/services/data/v1?dataset=normals-monthly-1991-2020&stations=USW00013889&dataTypes=MLY-TMAX-NORMAL,MLY-TMIN-NORMAL,MLY-PRCP-NORMAL&format=json)). On the coast, heavy infill that stays where it was laid is worth a lot. ## Infill wears down, whatever you choose No infill stays put forever. [UF/IFAS Extension](https://blogs.ifas.ufl.edu/global/2025/07/15/considering-synthetic-turf-what-homeowners-should-know-before-installation/) notes that synthetic turf “requires periodic brushing and replacement of infill, the granular material between the fibers.” The New Jersey study warns that where turf “is poorly maintained, infill losses can be significant.” A thin spot matters for more than looks. Infill holds the blades up and helps water drain, so a patch that has lost it stops doing both jobs well. Check the paths your dog runs and the potty spot each season, and top up with the same material that’s already there. ## Florida decides part of it for you On a Florida single-family lot of an acre or less, [Rule 62-308.100](https://flrules.org/gateway/readFile.asp?sid=0&tid=30839130&type=1&file=62-308.100.doc) allows infill of “clean silica sand, rock, shell, or other natural material,” allows coated sand if the coating is non-toxic, and confines rubber or any other synthetic infill to the footprint of playground equipment. The rule says “if used,” so infill isn’t required. [Florida DEP](https://floridadep.gov/sites/default/files/SyntheticTurfFAQ%20final.pdf) doesn’t permit or inspect turf. Meeting the rule still matters, because compliant turf is what state law protects from a local ban. If you’re counting on zeolite, ask your city or county how it reads “other natural material” before you order. Our [Florida infill guide](https://www.timelessgrass.com/guides/florida-turf-infill-rules/) covers the rule in full. ## Choosing for your dog 1. **In Florida?** Start from natural infill: sand, coated sand or another natural material. 2. **Worried about smell?** Add a mineral odor infill, and keep the rinse routine anyway. 3. **Full sun?** Plan shade first. Where rubber is allowed, TPE ran cooler than crumb rubber. 4. **Several dogs or a business?** Write down a rinse and sanitize schedule. 5. **Heavy rain where you live?** Choose a heavy infill that won’t float. 6. **Whatever goes on top,** make sure the base underneath drains. On the free visit we check the ground and talk through infill for your dog and your yard, before anything is priced. ## Common questions ### Is sand infill safe for dogs? The answer depends on the selected product and how the space is used and maintained. Florida’s standard permits several natural infills where it applies; it does not require sand alone. In a [2020 lab study](https://pmc.ncbi.nlm.nih.gov/articles/PMC7222665/), MRSA took 27 hours to lose half its viability in sand, against 12 hours in crumb rubber and 2 in EPDM rubber. That lab result is not a test of your yard or a prescription for a cleaning schedule. Follow the product instructions and plan care around actual use. ### Can I use crumb rubber in a Florida back yard? Not under the state standard. On single-family lots of an acre or less, [Rule 62-308.100](https://flrules.org/gateway/readFile.asp?sid=0&tid=30839130&type=1&file=62-308.100.doc) allows rubber or any other synthetic infill only within the footprint of playground equipment. The state doesn't inspect, but turf that meets the rule is what Florida law protects from a local ban. ### Which infill is coolest for paws? Of the rubbers, TPE ran cooler than crumb rubber: 45.6°C against 53.5°C in one study collected by a [2024 analysis of 23 studies](https://pmc.ncbi.nlm.nih.gov/articles/PMC11272752/). Shade did far more. The same analysis found sun against shade moved the surface by about 25°C. ### Does infill need topping up? Yes, now and then. [UF/IFAS Extension](https://blogs.ifas.ufl.edu/global/2025/07/15/considering-synthetic-turf-what-homeowners-should-know-before-installation/) notes that synthetic turf needs periodic brushing and replacement of infill. In a dog run, check the potty spot and the paths your dog runs most, since that's where it gets moved and rinsed away first. ## Related turf questions - [Why does pet turf keep smelling after it is rinsed?](https://www.timelessgrass.com/blog/why-does-artificial-turf-smell-like-dog-pee/) - [Will artificial turf help a dog with grass allergies?](https://www.timelessgrass.com/blog/artificial-turf-for-a-dog-with-grass-allergies/) - [How to clean pet turf](https://www.timelessgrass.com/blog/how-to-clean-pet-turf/) ## Where to go next - [Pet turf](https://www.timelessgrass.com/services/pet-turf/) - [Turf in Northeast Florida](https://www.timelessgrass.com/northeast-florida/) - [Turf in The Grand Strand](https://www.timelessgrass.com/grand-strand/) - [Turf infill in Northeast Florida: sand, shell or rock — not rubber](https://www.timelessgrass.com/guides/florida-turf-infill-rules/) Useful links - [Rule 62-308.100, Florida Administrative Code: adopted rule text](https://flrules.org/gateway/readFile.asp?sid=0&tid=30839130&type=1&file=62-308.100.doc) - [Florida DEP: Synthetic Turf frequently asked questions](https://floridadep.gov/sites/default/files/SyntheticTurfFAQ%20final.pdf) Free estimate ## Planning a turf installation? Tell us about the area you want to install or replace. We’ll call to arrange a free site visit. [Or call 303-349-2368](tel:3033492368) Your free estimate includes - A visit to measure your space - A custom layout, drawn for your space - Turf options, side by side - A written price, with no pressure to sign [Request a free estimate](https://www.timelessgrass.com/estimate/) Five short steps. We’ll call to arrange your visit.