need help with aggressive puppy

Maybe someone could help me out here...My german shepherd puppy just turned 5 months old. She lives with me and my boyfriend and was fine until about a month ago. We were at the dog park and this lady walked past to get her dog, and my pup jumped up and nipped her hand.she was okay, but it took me off guard, because she had never shown aggressivness before. when my boyfriend was alone with her, him and even his cousin would play with her in the yard & she was fine and really liked them just as well as she did me. In the past few weeks, whenever im around my boyfriend, she wont come near him and growls, but alone with him she was fine? Yesterday night, he let her out to use the bathroom. He was trying to get her back into the house ( which really doesnt enjoy and runs because she LOVES being outside ) so he was calling her name with no avail so he went to pick her up ( like he usually does ) and out of nowhere grabbed onto his wrist and arm and wouldnt let go, needless to say she hurt his hand and arm.We've taken her to obedience school and in public almost every single day to socialize her .I have owned many dogs, from chihuahuas to border collies to pitbulls, and they've never suddenly did a 360 like this, so im not sure what to do? I LOVE my dog, she is extrememly loving and loyal, but im so worried.shes UTD on all her shots and just got back from the vet at the beginning of Feb and everything was in great condition! PLEASE and advice or personal experiences would be so helpful!

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nascardoglvr

In Dogs

Reply To: aforrester

Wow, it really seems like you are in a tough spot with your new little guy.  I am not an expert trainer, but it sounds like there are two things going on here.  First off, when your puppy nipped the woman’s hand, did you enforce any obedience technique?  It’s really important to start training him and let him know what is "good" and what is "bad".  In reference to your incident outside with your boyfriend, this does not sound like the cause of a curious puppy playing.  Sometimes puppies can become afraid, and as a result, will lash out with biting.  This type of “fear” reaction is a little out of my league, but I would say it sounds like you might be in need of training class.  I know those can be expensive, but your local shelter/s should offer affordable training classes, especially for dealing with “fear aggression”.  Best of luck!

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aforrester

In Dogs

Reply To: nascardoglvr

I have been training with a professional since she was 10 weeks old twice a week, and in the dog park, of course, the dogs are loose and running around a huge park, i saw it from afar, so there was nothing that i could do about it. My dog is extremely obedient, but as far as fear goes, i think you hit the nail on the head. The question is why? cant seem to put a finger on it

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blacklab

In Dogs

Reply To: aforrester

I am sorry to hear that your dog is acting this way.  I always tell people its a matter of establishing who the Alpha is in the herd.  That way your dog will understand who is boss.

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JodiPUP717

In Dogs

Reply To: aforrester

thats to bad about your dog acting out that way. I always promote rewarding good behaivor and ignoring bad.

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Snoopy84

In Dogs

Reply To: aforrester

A friend of mine had a problem with an aggressive dog, and she took it into her local shelter and met up with their trainer who is expireinced dealing with aggressive dogs. She spoke very highly of the advice and help she received, and it didnt cost any money. Might be something you want to think about.

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