I learned of the availability of a rattlensake vaccination, so I had my three-year-old labrador retriever vaccinated, with the recommended booster. It's been a couple of months now, and the dog's tear glands have ceased to produce tears, and he now salivates excessively. We now have to administer eye drops several times a day. He has always been a very healthy dog with regular vet checks, up to date rabies, heart worm, etc. Has anyone heard of any connection between these symptoms and this vaccination. We can't come up with any other idea what might have caused this.