Hi. I'm Dr. Lee and will do my best to help.
What are you using zinc for? What disease are you trying to use it for?
How much elemental zinc is in your zinc citrate?
Zinc citrate is used to aid in reduced liver function and to boost the immune system in dogs, in cases of auto-immune problems such as Pemphigus. Zinc citrate comes in various doses such as 50 mg.
As a dietary supplement, the dose for a 90lb dog would be 30mg zinc citrate per day.
For use in zinc-responsive dermatoses in a 90 pound dog, you will need to use 80 to 100 mg of zinc per day.
Please let me know if you have any questions or concerns. Thanks.