Thanks for the additional information. It is helpful.
The first couple of weeks you had her, she would have been adjusting to her new home so it is not unusual to see a dog display other behavior once they are used to the new home.
It sounds to me like she is trying to herd you. It is a herding breed and many naturally display the traits of their breed. The nipping and focusing on your feet would be natural for them. They are also pretty high energy dogs as well. So she may be trying to herd you and try to get you to play with her.
In either case, there are some things you can do to help the situation. One thing would be to use a spray called bitter apple or some hot sauce on the shoes which would taste nasty when the dog put her mouth on them. You would need to make sure it was non staining first but it is effective at stopping a dog from putting her mouth on objects. Since she is still a pup, she is still teething so you may find she is chewing on things she shouldn't have and the bitter apple will help with that as well.
Now getting her obedience trained will help a lot toward stopping unwanted behavior as you can order her to walk in a specific place at your side and or sit and stay and thus she won't be able to bite your feet. The following site is helpful in helping owners train their dog. Be sure and click on the link to the page on obedience at the bottom. and links on subsequent pages leading to detailed instructions.
Training works best if you train at least 30 minutes a day (two 15 minute sessions). I would start making your dog work via the Nothing in life is free program (NILF). It is outlined below.
The way you walk can also discourage the behavior until she learns nipping at feet and biting them is unacceptable. You need to adopt an exaggerated walk with the heals coming up on the back swing until your dog is totally obedience trained. If you walk in this manner, when the dog gets too close to your feet, they will end up getting the shock of a heel coming up and possibly catching them in the jaw or chest. Since the person is just walking, it will surprise them. It usually only takes a few times before they stop jumping at the ankles or biting them. it is quite effective and works regardless of the age of the dog. It is especially helpful for pups as they always attack feet. Visitors will need to do the same thing and I'm sure most people will be happy to help until she is trained.
The other thing I strongly suggest with this pup is agility training if you can. she sounds like she may have a high drive which would be best channeled into an activity like herding or agility. For herding you would need to find an area farmer with livestock and a trained dog to help train her for working livestock. Some are agreeable, but others may find her to be more of a detriment. It is worth seeing if there is a farmer or trainer nearby willing to help her learn to work.
Agility is another outlet for her that will help channel her drive and energy. You can read how to start with agility on the following pages.
You can also use a leash on her to help redirect her attention and indicate what is unacceptable behavior. When she displays unacceptable behavior or focuses too much on your feet, give a short light tug to get her attention on you you and a firm low toned NO to indicate it is unacceptable. In addition, when she is acting acceptable, you want to reward her with calm praise and a tasty treat like hot dog sliver or vienna sausage sliver. This helps teach her how you want he to behave.
Finding her a playmate that is male and similar size and breed will help as well since she will have another avenue to use up that excess energy. Obedience classes is a good place to find a suitable dog.
Between training, redirection and exercise, this behavioral issue should be solved pretty quickly.
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