Mongrel/ˈmʌŋɡrəl/ Definition 1 of 3Pro Tip 1/3Affectionate Overtone Often used with a sense of affection for the dog, despite its lack of pedigree. Our lovable mongrel has the best temperament. Pro Tip 2/3Not Offensive Calling a dog a mongrel is not insulting; it's a neutral description of its mix. Yes, she's a beautiful mongrel with a shiny coat. Pro Tip 3/3Non-Specific Breed Mongrel doesn't specify which breeds are mixed; it's any combination. Someone abandoned a mongrel puppy at the shelter.