It appears that you pup did not have a lot of socialization even before she left the litter. Terriers do tend to be very tenacious but the level of aggression you are experiencing sounds like socialization issues and could also be some genetic weakness.
You have a road ahead of you. If it is just socialization you could possibly overcome the problem with some consistent socializing techniques. Watch for any activity that would lead you to think that this behavior could have anything to do with the breeding. Did you get to meet both parents?
Maybe try to discuss with the breeder what kind of conditions this pup was raised under. Don't accuse, just listen to what the breeder says about the methods they use to raise their pups. Puppies should be gently handled several time a day by the breeder from day one in order to start the socialization process. When they start walking they should have play time with a human several times a day with lots of holding and kisses, no rough play.
Sadly, many breeders want the puppies gone when they are weaned because they face a lot of cleaning up after the pups when they go on solid food. The mother dog does all the cleaning until the pups are weaned. At that point the mom starts showing them where to potty if they are not separated. This is also when they start learning how hard they can bite and roughhouse without getting bopped by the mom or a litter mate
Make sure no one plays tug or any other type of play that will get this puppy riled up. Your pup sounds like it needs to be taught how to be calm more than getting all excited. A good chew like a bully stick will help keep the mouth busy with constructive chewing rather than biting people. |