Nylon. Vinyl. Thermoplastic rubber. The "tough" chews filling pet-store shelves are plastic by another name — and a chew is the one plastic a dog works in its mouth for hours. We thought that was worth questioning.
A chew has one job: survive a determined dog. For decades, the industry's answer was to make it out of plastic hard enough to crack. That solved durability — and quietly created three problems.
Veterinarians use a simple test: if you can't dent a chew with your thumbnail, it's hard enough to fracture a tooth — especially for strong, determined chewers. A cracked molar is painful, and the repair is one of the more expensive things at the vet.
Widely cited veterinary guidance (the "thumbnail test").
Plastic chews don't vanish as they wear down. They shed microscopic fragments and fibres the dog ingests while chewing. Those particles are now being found inside dogs' bodies: a University of New Mexico study detected microplastics in every canine sample it tested, and linked certain plastics to lower sperm counts.
University of New Mexico, published in Toxicological Sciences.
Plasticizers like BPA and phthalates make plastic soft and flexible. Research has shown they can leach out of chew-and-mouth products into a dog's saliva, and both are recognised endocrine (hormone) disruptors. Here's the honest part: the long-term effects in dogs specifically aren't fully proven. We'd simply rather not run the experiment on someone's dog.
Studies on BPA/phthalate leaching from pet chew products; effects in dogs remain an emerging area.
It's not just the toy. Microplastics now turn up in pet food, in tissue, in the soil. The chew is one input you can actually control.
A University of Sussex study found microplastics in 76% of the pet foods it tested. Exposure adds up from many directions — which is exactly why the easy wins matter.
Greenheart chews aren't plastic with a green label. They're made from Amazon açaí bio-resin — a plant-based material drawn from a renewable rainforest resource, inspired by the strength of the açaí palm trunk.
No BPA, PVC or phthalates — and no plastic to shed as microplastics.
Certified TÜV Austria OK compost HOME — when it's done, it returns to nature instead of the landfill.
Responsibly sourced from the Amazon, not from petroleum.
Strength shouldn't cost your dog its teeth, or fill it with plastic it never asked for. That's the whole idea behind Greenheart.
See the chewsThis page is informational. It describes concerns associated with plastic materials in general, not any specific competitor product. Research into the long-term health effects of microplastics and plasticizers in dogs is still developing; nothing here is veterinary advice. Talk to your vet about what's right for your dog.
