I'm really sorry you had this happen - I know it's horrible to feel like you did something wrong in the heat of the moment -something you would normally not do. It took a lot of courage to tell us about it - I'm sorry you are getting some "heat" for doing it - you already know it's not right & you feel bad about doing it. Most importantly of all now is that it happened, Gizmo will be ok, you will be ok (as long as you take care of the wound) and you are looking for ways to remedy the situation. IMO alot of small dogs don't have the "leadership" they need - this leads to confusion and insecurity in the dog because they think they have to be "pack leader" since you are not doing it. Especially with new dogs in the house - Gizmo may think he has to be the boss - since you were being verbal and upset about the shepard puppies being out Gizmo may have been trying to "take care" of the situation on his own. He may not have done it appropriately but it really isn't his job. You have gotten some really good suggestions here, having him on a leash is a great idea, a trainer is also a good suggestion, making sure he is neutered is a must (I don't know if he is or not). If you are not able to hire a trainer or until a trainer can come I would suggest you implement the NIFIF (Nothing In Life is Free) concept to help Gizmo realize that YOU are qualified and are his pack leader. Here is an article I wrote about NIFIF - Good Luck
Teresa
That's very frustrating isn't it? You are right to be concerned and to look at fixing this before it gets worse. One thing I always ask right away - is your boy neutered? Sometimes hormones can make a dominate dog worse and dogs sometimes think they can challenge the "pack leader" or try to assume the position themselves. If he isn't neutered I would suggest you check in with your vet about getting this done as well as making some changes in your home.
#1 if you are able enroll him in an obedience class and do either # 2 or #3.
#2 work with an animal behaviorist or
#3 Teach him that you are the "pack leader" and do the Nothing In Life Is Free (NILIF) program.
You can google this program and find sites that tell exactly how to implement the program but basically it means acting like a good "pack leader" so he will respect you. (Growling, biting, food or resource (you) guarding is a show of disrespect or trying to take over leadership). Some things you can do in this program is making your dog work for everything - food, attention, exercise, etc. I.E. he has to sit before you put his supper bowl down. Make sure you eat before feeding him (pack leaders always eat first and lower ranking animals eat after). Always make sure you are the one who allows him outside and you go out before him, he has to follow you. For the time being don't allow him to sleep with you or be higher than you on the couch. Allowing him to precede you out the door, be higher than you on the couch, sleeping in your bed, eating when you eat are all signs that he is equal to you or higher than you in the pack and just enforce his right to be disrespectful or to let him think he can take over.
A dog that knows his place in the pack is much happier and feels more secure. After all, it's your job as pack leader to provide food and keep the pack safe and he won't have to worry about it.
If you have a spouse or children make sure they participate in the program as well. The dog should always be below them in pack ranking also, otherwise he will try to push the kids/spouse around too.
Good luck with your boy, you can PM me if you have any questions about this program. It works wonders with dogs.
Teresa