Aaron from Gallatin, Mo writes
Every thing else that I have used just washes off in the rain, and the flies are terrible.
Bifen IT is not labeled for use on animals in any way. We would recommend using Martin's Permethrin 13.3% which is safe to use on horses, swine, cattle, cows, beef, dairy, sheep, goats, pigs, poultry, chickens, and dogs and has a 4 week residual. Please refer to the product label for application instructions.
Answer last updated on: 10/10/2016