Pyrethrins are naturally occurring insecticides derived from the flowers of certain chrysanthemum species. They are used to repel parasites such as fleas and ticks in dogs and cats but can be toxic if used improperly.
Pyrethrins are naturally occurring insecticides derived from the flowers of certain chrysanthemum species. They are used to repel parasites such as fleas and ticks in dogs and cats but can be toxic if used improperly.