If you've owned your dog for awhile, you undoubtedly have developed a special bond. One reason your dog naturally bonds with you is because dogs are pack animals. Dogs are generally happier as part of a pack whether it's human or canine, but most dogs seem to welcome a canine companion. So the question is: Should you adopt a second dog?
Dr. Stephanie Borns-Weil, the veterinarian who heads the well-regarded Tufts Animal Behavior Clinic, believes that "dogs in general are happier with other dogs. It's hard on social creatures not to live with their co-species members." Still, getting a second dog should not be a hasty decision. “A dog might enjoy another dog initially,” she says. "But the two dogs may not display their full range of behaviors in that situation, and they have to make a quick decision based on initial impressions. We’re layering our own best judgment over that to create what is essentially an arranged marriage that may or may not work to best advantage.”
The Tufts University Cummings School of Veterinary Medicine has some excellent, authoritative suggestions for how to add a second dog to your household in an informative article, "Would Your Dog be Happier with a Second Dog?" Read it here: https://www.tuftsyourdog.com/dogownership/would-your-dog-be-happier-with-a-second-dog/