It’s true they cannot endure freezing weather for extended periods, but they often find ways to survive anyway. In fact, some species of ticks are most active in winter. Adult blacklegged ticks, for example, take their first blood meals during late fall or early winter.
Unfortunately, the same features that make flea collars effective also make them dangerous to both pets and humans—serious, even life threatening, side-effects have been linked with exposure to the chemicals found in flea collars.
While a flea or two isn’t usually a cause for panic, if left untreated they can quickly become the worst bug problem you’ve ever faced. Given that a single female flea can produce a population of over 20,000 in just 60 days, it’s not hard to see how fast things can get out of hand. All of which is to say, if you think you might have fleas, you need to act immediately.