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Hello, this is Dr. Jess. I am sorry to hear about your dog! So to confirm, she is unable to stand or walk on her own?
That is fine, I am not set up for phone calls anyway (I think the site automatically gives you that option, but not all of us are able to do calls). I may not be online in an hour but will check back on later in the day to see your responses.
Hmmmm... it is a very tough thing to evaluation without seeing her in person. We worry in dogs having issues standing about lesions on the spinal cord- most commonly a herniated disc pressing on the spinal cord and causing weakness in the legs. We also worry about arthritis causing weakness (though this is usually more gradual). We worry about trouble standing due to overall weakness (i.e. from anemia).
Unfortunately, without examining her in person, I don't know how much more information I can give you based on her description. I do truly think she needs a veterinary exam.
Glucosamine can be helpful for arthritis, but is not going to help other conditions that can cause difficulty staying in a standing position. Glucosamine can also take 4 to 6 weeks to see the effects, so it isn't something that is going to help in the short term.