Anyone have ideas on what could be affecting our dog s demeanor??

We have a 7 year old English Doberman. She is a healthy dog, but has begun to be aggressive with our 8 year old American Doberman. They have been together for 2 years now, so we don t know what has changed. Both our neutered/spayed. She is loving loving towards us, but we are concerned that her aggression towards... show more We have a 7 year old English Doberman. She is a healthy dog, but has begun to be aggressive with our 8 year old American Doberman. They have been together for 2 years now, so we don t know what has changed. Both our neutered/spayed. She is loving loving towards us, but we are concerned that her aggression towards us could change.
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