My husband recently put down some fertilizer on our lawn. I'm hesitant to let the chickens out to free-range as these are little very small pellets. The package doesn't say the fertilizer is harmful to pets, etc. but it does say "harmful" if swallowed. Being the food hounds that chickens are and knowing that they'll want to taste and see if they find one of those pieces, I just don't want anything to hurt them.