BioKill biocides are safe to warm-blooded animals (i.e. dogs, cats, and rabbits, etc.) but highly toxic to fish and reptiles. The active ingredient used in BioKill Universal contains Permethrin. The same active ingredient is also used as spot-on applications for dogs for the treatment of fleas/ ticks. These types of products contain extremely high concentrations of Permethrin in a different formulation and are in no way the same as BioKill Universal.