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Why is my senior dog lethargic, not eating, and constipated?

Updated On September 23rd, 2025

Pet's info: Dog | Beagle | Female | 12 years and 4 months old | 20 lbs

My 11yr old beagle has suddenly (over the past week) gotten very lethargic, isn't eating like normal (is still drinking ok) and is having very small bowel movements. This isn't like her at all. She moves like one of her back legs is sore or stiff but will run on a leash if I take her for a walk and was running (for not even 2 minutes) earlier today. She doesn't show any signs of discomfort if I move my hands down her spine and legs.

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on September 2nd, 2017

I'm sorry Dixie isn't doing well at the moment! Anorexia and lethargy are unfortunately common signs of a number of different illnesses, such as kidney disease, liver disease, heart disease, systemic illness, infection, inflammation, injury, arthritis, or even cancer. Dogs can be very stoic when they are ill, and oftentimes it appears that these symptoms of illness come on suddenly when actually the dog has been ill for a bit. The best thing to do is rest her over the weekend, and have her seen by a vet on Monday for a health check. I recommend doing a geriatric blood panel and urinalysis in addition to a physical exam to survey how her organs are functioning. The vet may also want to do chest x-rays to check on the size and shape of her heart. Using these tests, the vet can hopefully make a diagnosis so that treatment options can be discussed and started. I hope this helps!

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