Our solid Copper dog collars are an effective natural pain relief. The copper collar also has four 1700 gauss neodymium rare earth magnets that will help to relieve the symptoms of arthritis. Copper has been used for medical purposes for thousands of years. The copper is absorbed through the skin and is chelated to another compound that exerts anti-inflammatory actions. It is common for elderly dogs to suffer from arthritis. Certain breeds of dog are more likely to develop arthritis than other breeds, especially if the breed is large such as a German Shepherd or Labrador. Dogs that are overweight tend to develop arthritis due to the extra weight on their joints and conditions such as hip dysplasia and patellar subluxation cause cartilage erosion that aggravates arthritis. We recommend using them alongside their normal collar as copper is not strong enough to use as a lead collar. Common symptoms to look for are: Reduced activity- Limping- Difficulty getting up from a lying down position- Difficulty jumping up on things- Chewing or licking at joints- Difficulty climbing stairs- As these are MADE TO MEASURE you will have to measure your dogs neck and choose the correct size. When measuring please leave 2-3 fingers behind the measuring tape to give a more comfortable fit.