Dog might have eaten tiny piece of plastic

Earlier today my dog chewed up the plastic top of a novelty stylus. We found the base part chewed in half but the tiny thing at the top was missing. It is about the size of a grain of rice and a rubbery type of plastic. No sharp edges. He is a 10lb Pomeranian. Will he be fine? He has eaten bits of plastic/rubber before and once or twice my acrylic nails.

Species: Dog

Age: 3

Neutered Male

Breed: Pom

Body Weight: 10 lb

History: N/A

Clinical Signs: None

Duration: N/A

General Location: US