Being able to adjust the collar is a benefit that one should look for when buying dog collars for big/large dogs. It allows for modifications when the dog inevitably grows, resulting in a longer-lasting dog collar. Moreover, it aids in finding the perfect fit for your dog's neck. Nowadays, dog collars come with an adjustable metal buckle, which makes it easy to adjust a dog collar as a smaller or bigger depending on what is comfortable for your pooch.