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Why does my senior dog's back legs shake and tongue hang out?

Updated On September 23rd, 2025

Pet's info: Dog | Jack Russell Terrier | Female | spayed | 12 years and 9 months old | 20 lbs

Hallo My female Jack Russel is turning 12 in April. She has been shaking in her back legs for a few months now. Her toung hangs out whenever she starts shaking, like shes hot or need water. But its neither heat or water. Sometimes i think shes going through menepause. Heat strokes etc. Shes still very alive, runs with me every morning, hearing has gone a bit, but she is still the same old girl i got as a pup! What could it be?

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on February 8th, 2017

Dogs do not go into menopause like humans do, so that will not be the cause of her symptoms. In senior dogs like Mia, arthritis is very common, and that would cause her back legs to shake. Dogs are quite good at hiding pain, so it could be that even though she is running with you and seems normal, it is painful to her, leading to the leg shaking and tongue hanging out. It could also be a sign of muscle weakness or simply a result of her aging. I would have Mia seen by a vet tomorrow. If she does have arthritis, the vet can prescribe some pain medications for her. Please do not give her any human pain medications, as many are toxic to dogs and can be fatal if given.

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