However, Italian researchers have found that the
LD50 (the lethal dose at which half of the animals die) of glucosamine sulfate is 8000 mg/kg. In humans this would be equivalent to ingesting over 500,000 mg at one time or 1,000 pills each containing 500 mg.
I hope this is useful... I got the idea from the site that max safe dose is 1500mg, and your dog had twice that much. You may want to see the vet anyway, even tho it says in the previous paragraph that a lethal dose is 8000mg.