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My senior dog has cancer and is suffering. When should I put him down?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | 8 years and 4 months old | 71 lbs

Our dog wasn't eatting. We took him to the vet had blood work done his belly Ruben was high. We took him to a specialist to have ultra sound and xray. Our dogs liver is small intestine are inflamed lungs clear. Specialist said looks like cancer. He could do a biopsy to determine exact cancer but that's $700.00. We don't the funds to do that. My question today he's not eatting again and throwing up. When do I know it's time to put him down? I don't want him to suffer. He's 8yrs old lab shepard.

2 Answers

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on August 19th, 2017

Hi there! Thanks for letting us take care of you today! Sorry to hear about Ruger. I definitely know where you are coming from as I mostly see cancer patients. What I usually tell my clients is that the time to consider humane euthanasia is when they stop being themselves. For example, when they stop doing 3 out of their 5 favorite things (eating, playing, or whatever these are), it is time to let them go without suffering. Of course this is if not considering treating the cancer. There are always palliative medications you could consider like prednisone and anti-nausea medications (as cancer can cause nausea depending on the type) just from a palliative standpoint to try to make Ruger feel better in the meantime. Sorry you are going through a rough time.

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    Answered By Ana M, DVM

    Veterinarian

    Published on August 9th, 2018

    Thank you for submitting your question regarding your dog. I am sorry to hear about his diagnosis. The antibiotics will likely help provide him some comfort for a period of time. Pain medications will help as well. However, the cancer is a terminal diagnosis. When discussing quality of life, I want the patient to still be having more good days than bad days. The patient needs to be able to eat and drink adequately as well as having enough mobility to get around comfortably. Finally, I want the dog to still have some joy in his life. When these needs are no longer able to be met, then it is time to consider euthanasia. I hope this information provide you some objective criteria. Again, I am sorry for your situation.

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