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Why is my active dog suddenly lethargic, aggressive, and won't stand?

Updated On September 23rd, 2025

Pet's info: Dog | Blue Heeler | Male | unneutered | 2 years and 7 months old | 60 lbs

2yr dog is lathargic, and aggressive if you go near his back legs. Yesterday, he was playing fetch, running around, happy. Today he was sluggish and has progressed to not standing or eating. He is still drinking water and urinating but our typically VERY active dog will only get up to drink/urinate. He wont lift his head unless he hears a loud noise. Normally goes for three walks a day and plays fetch in the park. He had no interest in walks or fetch or eating. At all.

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1 Answer

Most Helpful Answer

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Answered By Lindsey Edwards MVB, BSc, IVCA

Veterinarian

Published on October 4th, 2018

Please have him assessed by a vet urgently, it sounds like he is extremely painful and this may be due to a severe injury, spinal pain, infection or hip dysplasia and treatment will depend on the underlying cause

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