Yes. The Tag is approved for use on puppies and kittens from 8 weeks old, and FurLife makes a separate version specifically sized for cats.
The reason it is safe for animals that young is the same reason it is safe for senior pets and pets with prior seizure history. Nothing enters the bloodstream. Nothing absorbs through the skin. The oils diffuse into the air at a concentration that repels parasites but does not affect the animal wearing the Tag. There is no organ load, no liver stress, no neurological risk. There is just a shield.
Mochi can wear hers. Daisy can wear hers. They can sleep on the same bed and the Tags do not interact with the animals or with each other.
Linda left my clinic that afternoon with her five answers.
She ordered one Tag for Daisy in the parking lot, and one for Mochi an hour later from her kitchen.
11 months later she came back for Daisy's annual checkup. No fleas. No ticks. Bloodwork clean. Her hand was just resting on Daisy's back, not searching it.