Question: are hartz flea collars any good?
Answer: Best Budget Pick: HARTZ Ultraguard Flea and Tick Collar It's designed with large dogs in mind, and fits necks of up to 26 inches around. It might not be quite as effective as some of our top picks, but if you're looking for a preventative, rather than a cure to a serious flea infestation, it should work well enough.