I personally think this product is so bad for any dog especially a toy one.
The plastic ones are not digestable and tiny slivers of plactic are ingested.
It is like swollowing pins.

They become logged in the lining of the stomach or
bowel track and can cut into each causing bleeding. I know because
Buddy chewed them until he was hospitalized with vomiting continuous and severe blooding diahrea. It was a possibility the vet
said. Stop giving them to him. 4 days later he was ok.
Read the labele. It states small pieces, like a grain of rice, might come off
and "SHOULD PASS!" What happens if it does not. Hospitalization, that's what.
For the digestable ones I tried once and he ate the whole thing in minutes. No more. Try natural plain white bones. I get them in the
pet store.