Our gsd has had a reallllllly bad bit of agression today. She has never been like this before. She is 17months old. We have only had her just over 2weeks, so we dont know her history if she has ever bitten before.

My OH was going outside, and left her inside, when he came back in literally 30secs later, she went daft, snarling, growling, jumping up, barking (completly and utterly out of character since weve had her)
We put her in another room, and closed the door. 20mins later we let her out, she was fine.
My OH brother just came here, and she has done the same to him.

Any advice??

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Mummy to Sheba. My lovely gorgeous bundle of fur