Treats and chews
What is the knee test for dog chews?
Last updated 23 September 2026 · How we write and check this
Short answer
The knee test is a rule of thumb some vets suggest: if you would not want to be hit on the kneecap with the chew at full force, it is likely too hard for your dog's teeth. It works alongside the thumbnail test, pressing a nail into the surface to check for any give, as a quick way to judge hardness before handing a new chew to your dog.
How the test works in practice
Holding the chew and imagining, or lightly testing, how it would feel striking your own kneecap gives an intuitive sense of an object's rigidity that most people can judge instinctively, without needing any special equipment, which is why the comparison has become a popular shorthand among vets discussing chew safety with owners.
Combining it with the thumbnail check
Using both the knee comparison and a direct thumbnail press into the surface gives a more reliable read than either alone, since the knee test captures overall rigidity while the thumbnail test more specifically checks for any surface give at the exact contact points a tooth would experience.
What tends to fail this test
Antlers, weight bearing bones, and very hard nylon toys reliably fail both the knee and thumbnail tests, while softer chews like bully sticks, dense rawhide alternatives, and rubber toys built for chewing usually pass, giving owners a fast way to sort a mixed pile of chews before offering any to their dog.
Key takeaways
- The knee test asks whether you would want to be hit on the kneecap with the chew at full force.
- Pairing it with a thumbnail press gives a more reliable overall hardness check.
- Antlers, weight bearing bones, and very hard nylon toys typically fail this test.
- Softer chews like bully sticks and rubber toys generally pass both checks.