Night Aggression (Edited)?

My 4 year old dog is only aggressive at night. Does anyone have any idea why this might happen? He was a stray so we are thinking maybe it's a protective instinct or something...?? What do you think?

Edit: I was asked to give more details. So during the day my dog is well behaved. He listens pretty well and shows absolutely no aggression what so ever. He's just normal. Then around 9 o'clock he becomes easily angered and it's gotten to the point where if I even stand up and take a few steps or reach to grab something he will snarl at me. He's bitten me once and put holes in 3 or 4 of my shirts but the growling happens every night. I don't know how to stop this because I don't know what causes it. It's only at night which I don't understand. Please help!

Asked by Member 1037035 on Dec 31st 2011 in Aggression
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I would get his eyesite checked. It sounds like he is unable to see at night.
There are several hereditary eye diseases in dogs which begin as night blindness, most notably, progressive retinal atrophy. This disease generally starts at around four years old.
A veterinary opthalmalogist can test for this or other eye problems.
Good luck!

Member 641257 answered on 12/31/11. Helpful? Yes/Helpful: No 1 Report this answer