Petco Text Logo
Petco Pet Logo
  • Two Easy Ways to Start Earning Rewards!

    rewards header
    Become a member today!
    Members-only pricing and offers, personalized care notifications, Vital Care points back on every purchase and more!
    Petco Pay LogoBecome a credit card member today!

    Earn 2X Pals Rewards points at Petco
    when you use Petco Pay!

    APPLY NOW
    Learn More About Petco Pay Benefits

Why does my dog get aggressive and protective walking in the dark?

Updated on September 23, 2025

Pet's info: Dog | Border Collie | Male | neutered | 7 months and 7 days old | 50 lbs

I went for a walk lastnight at dark for a change and Loki was super over protective and aggressive towards every passer by. He even tried to bite my friend I met up with. He's never like this during the day! And he has met this friend once before. We walked with my friend for a while and he eventually calmed down and got friendly with my friend.

1 Answer

Most Helpful Answer

Dr. Melanie, BVSc MS

Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on December 11, 2016

It could be that walking in the dark made Loki a little nervous, and he was trying to be protective of you. If it's not a time he's used to walking at, it's a new environment and experience for him, and it may make him a little more weary. It's good that he eventually calmed down, and it sounds like he may have adjusted to the new situation. If he doesn't seem to like walking in the dark, I would take him out when it's light out instead.
Vote Icon1Pet Parents found this answer helpful

Smart Picks for Smart Questions

Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Share

Styled arrow button