I have one doberman, just turned about 1 year 4 months. very similar issue though. he is very loving and sweet all day to my husband and myself and anyone who comes in the door. but he was randomly wake up in the middle of the night and its almost as if he doesn't know who we are starts growling and nipping at us. never has drawn blood, but it's quite scary. he gets better once we turn the lights on and then typically runs out of the room and sleeps on the couch. we have a night light so the room isn't completely dark. it just started happening 2-3 months ago. and it's very random, not every night, but occurring more frequently. he has slept in our bed with us since we first got him at 2 months. I can't think if any change in his day-to-day patterns that would cause this abrupt change. any thoughts?
This is an old thread, hopefully people will see your post and respond. You need to see a veterinarian for a thorough exam. I'd be worried about neurological or vision issues, or something going on health-wise. This isn't normal behavior at all and if it's only happening at night and he's waking up from a sound sleep, I'd be seriously concerned, especially if it never happens at other times. Please get in to see a vet immediately.
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