My dog is suddenly aggressive and biting only at night. What's happening?

Question

My dog turns vicious after dark.Every night after dinner,she turns from sweet dog into Mrs. Hyde.She goes after us like we are strangers,snarling and even biting us.But only at night.We have had her since she was 3 months old,and is now 2 years.This just started in the last few months.I tried putting her in the laundry room at night,but she barks so much no one can sleep.So I let her out,she walks about 15 feet,then turns on me.What is wrong with her?Please help!! Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | unspayed | 2 years and 2 months old | 65 lbs

Lauren Kennedy, DVM · Accepted Answer

Abrupt changes in behavior like this in dogs is very concerning to me. I would be worried about some underlying neurologic disorder that could be going on. If nothing has changed at home, her routine, or the environment in general, then I would suspect an underlying medical issue. I would recommend taking her to be examined by your veterinarian and possibly having some lab work performed so they can try and determine what is going on. Your vet may recommend further work up by veterinary neurologist or may recommend a behavior modification drugs like Xanax or Prozac. I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach. Best of luck.

My dog is suddenly aggressive and biting only at night. What's happening?

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