With summer comes glorious sunshine, warmer weather — and ticks! Flea and tick products/medications include ingredients like permethrin, pyrethrin, or fipronil - pesticides that kill insects by paralyzing their nervous system, which is also how nerve gas works. These chemicals have the same effect on an animal's or human's nervous system. Amber collars, as tick and flea repellents, work in two ways for dogs (and cats) - and they do it naturally! Plus a DIY tick repellant for your dog.