salvo flea and tick collar for dogs - pack of 2 for 12 months of protection - waterproof, durable dog collar - flea and tick prevention for dogs (large) salvo salvo protects dogs against fleas and ticks. our improved formulation kills fleas on contact and is effective against three species of ticks, deer ticks, american dog ticks, and brown dog ticks. the collar is non-greasy, odorless, and long lasting. each tin contains two individually packed and sealed collars. each collar provides continuous protection for six months, giving you twelve months coverage with each purchase. the salvo collar is water-resistant and remains effective following a bath, swimming or after exposure to rain or sunlight. the peel-away comfort strip provides a smooth surface to minimize irritation, and the proprietary triple clasp system ensures collar stays engaged in the most demanding situations.