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Thank you for your question. My name is***** and I'd like to help with your question. Can you tell me a bit more.
Did the veterinarian do any X-rays? Are all 4 legs affected? Was this something that came on suddenly or has he had trouble getting up and moving for a while?
Where is the tumor? The timeline really depends on what the underlying problem is... For example, if he has a tumor in his spleen then he could be week from blood loss and low blood pressure. Without quick, surgical intervention these dogs can die very quickly... hours to a few days. But if he is not moving from an orthopedic (bone/joint) or nerve problems they can last for weeks and weeks. Even not eating they can linger for a month. Given that your vet xrayed the chest and abdomen and not specifically the hips, I suspect they felt the tumor was more responsible for his condition than anything like arthritis, but then the glucosamine injections target arthritis. Did they tell you more about the tumor?
Hum, chest tumors can cause coughing and breathing problems, but not necessarily make them go down like that... but the oncologist will know more when he sees the X-rays.
In short, yes, it is fine for them to be immobile as long as they are receiving good nursing care so that they don't urinate on themselves or develop sores. As long as you are able to get him up to go to the bathroom and he is moving enough to shift positions... so that he isn't always laying on the same side and positions... it is fine to give him some time to recover.