How often does a dog need to have their nails trimmed? Well, it depends on the dog really. Some dogs spend a lot of time indoors and are not exposed to surfaces like concrete and pavement that help to naturally wear down their nails. So of course theses dogs will tend to have longer nails that need trimmed more often. The best indicator to go by is whether or not your dog’s nails touch the floor while they are standing on all fours. If they touch the floor then they may need trimmed. Because a dog’s front nails tend to grow faster than the nails on their back paws, the rear nails usually do not need to be trimmed every time the front nails are trimmed. Most dogs need their nails trimmed every month or two.