Bob Martin Dog Flea Collars are for the control of fleas and ticks on dogs over 3 months of age. Gives protection for up to 5 months. For dogs over 3 months of age. Not suitable for use on nursing bitches. Remove fleas from young puppies and nursing bitches by careful use of a flea comb. Bob Martin Flea and Tick Collar for Dogs (5 Month). Bob Martin Flea and Tick Collars are an effective way to rid your dogof fleas and ticks whilst helping to condition his coat leaving it glossy and healthy looking. Each Bob Martin Flea and Tick Collar will keep him flea and tick free for up to 5 months.