Veterinarians recommend having nails trimmed at least every 4 weeks, but it depends on each individual dog, and how quickly their nails grow and/or become naturally ground down. Dogs that wear down their nails by walking on pavement or cement, may only require nail trimming every 6 to 8 weeks. Also keep in mind that once your dog becomes a senior or less active for any reason, they may no longer be wearing down their nails like they used to, and will need to begin regular nail maintenance.