Fleas multiply at an exponential rate. One may find them in the park, just outside, on other animals, etc. Ticks mainly live in forests and areas with tall grass. You are probably thinking now "my dog is not threatened by ticks, because we do not hike through the woods. Accordingly, there is no need to look for a dog flea and tick treatment collar". But that is not the reason to calm down because there are often cases of tick bites occurring in urban settings. Fleas can live in a park, in the grass and even in the yard of your house.