Has Anyone Ever Known A Dog To Get Sick From Taking Glucosamine?

I have given her dosage in the past and found out that I was giving her too much. I have started again recently, giving her the proper amount according to her vet. She is a very large (not fat) Golden Retriever, so he said to give her 1500 mg per day (split 750 twice a day). She refused to eat this morning and still had not eaten when my husband checked on her at lunch – that is not like her at all. She is also very lethargic. My first intuition is to stop the Glucosamine again, but I don’t want her joints to go bad. She is only 8 years old.