These washable dog rope toys are made of 100% natural cotton fiber. Safe and environmental-friendly for dental chew. These interesting dog rope toys can help your dog relieve boredom and pressure, alleviate your dog's separation and loneliness, keep your dogs happy, healthy and entertained. The puppy toy ropes can be used for both indoor or outdoor playing. Dogs see the world mainly in grayscale because they can only distinguish two levels, yellow and blue. The yellow and blue dog toys easily draw your dog's attention. These toys can clean your dog's teeth, massage gums, improve dental health, reduce plaque build-up, preventing gum disease and promote a puppies new teeth growth, help them grow healthily and happily.