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You are OK, you only need a tetanus shot every 10 years.
About the aggressive behavior - I have Yorkies but neither have ever bitten me when I've taken things out of their mouth. I have heard of that though. I think there is a procedure where you have to make them understand that you are in control of food, not them, and that you are the pack leader.
I know this is not everything that needs to be done, and I probably have some of it wrong, but this is what I remember. You do not free feed the dog (I know I know, I free feed mine, and you probably do too). You only feed them at a certain time and you do not leave the food down, even if they don't eat.
You make them sit (in front of the food) before you put the food down and you do not let them eat until you tell them to eat. I have seen people get down and act like they were eating the food in front of the dogs while the dogs were having to sit and wait. This lets the dog know that you are in control of the food, not them.
I also think that part of the process is making them stop eating and sit for a bit till you tell them to go back to eating.
That's all I remember and I'm sure others will have better/different advice. It is a dominance thing - Gucci thinks she is the pack leader, not you, or she would acquiesce what is in her mouth without a fight. You are right to be concerned. She might bite a child if they were to try to get a toy from her.
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 Gayle
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