The real cost of getting a dog is more than just the dog’s purchase price — long-term costs need to be considered as well. GOBankingRates conducted a study to find out which 30 breeds are the most expensive dogs to own. Factors that were considered included the dog’s purchase price, grooming expenses and potential health care costs for common issues faced by the breed. Here are the top 5: 1. The Tibetan Mastiff is the most expensive dog breed to own with average purchase price of $3,000. 2. Black Russian Terriers are one of the most expensive dog breeds money can buy, with an average price of $2,000. 3. If possible, you might want to considering adopting a Portuguese Water Dog instead of buying one — its purchase price averages a sky-high $2,500. 4. A gentle giant, the Irish Wolfhound is one of the most expensive dog breeds to buy and own, with an average price tag of $1,900. 5. Often described as the perfect family dog, buying a purebred Golden Retriever will cost you around $1,500.