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Why won't my dog with an enlarged heart lay down and is so tired?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed | Female | unspayed | 8 years and 2 months old | 16 lbs

My dog got diagnosed with an enlarged heart on Monday. She has been given some medicine and is breathing better, but she wont lay down and is very tired.

1 Answer

Most Helpful Answer

Catherine Stecyk

Answered By Catherine Stecyk

Veterinarian

Published on July 5th, 2018

Hello and thank you for reaching out to Petco Pet Education Center, formerly Petcoach. I’m sorry to hear that Allie Mae was diagnosed with an enlarged heart. It sounds like she is still having some difficulty breathing which can explain why she is reluctant to lay down. Laying down can cause some compression of her rib cage and make it harder for her to breathe. I would recommend having her evaluated by your veterinarian as soon as possible, because it sounds like her heart disease is not well managed. Heart failure causes fluid to build up in the lungs, and this can be life-threatening. She may require further cardiac work up and changes to her medications. I hope this is helpful!
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