Let's say you have invested in a beautiful female Dane and she will be the foundation for your kennel's future. Now you need to find a mate for your dog. Define what qualities your dog's mate must have to assist the likelihood of the offspring being closer to the Breed Standards than either the sire or dam. For example, if you own a bitch whose head seems slightly smaller than ideal, look for a sire that has a large head. If your bitch has just a slight drop in her top line, look for a male whose back is level and strong.
Every dog has a fault no matter how many International champions and obedience titles the dog has.
If you are unsure of what is standard call, AKC they will have videos and information on your breed and they will also have reputable breeders who you can contact to help you determine if your dog is conformationally correct. If the dog isn't, don't breed. It is very difficult to correct faults with 1 or 2 breedings. It is easier and faster and wiser to start over. Look into reputable breeders who show and have AKC titles champions.