DR Singdaw....I found this in an online article about it
"Fortunately, over ninety percent of dogs treated within the first week of obvious signs of Lyme Disease will respond rapidly to treatment with a tetracycline antibiotic. This medicine is administered for at least three weeks. In my experience, five percent of dogs will have some type of relapse of signs such as cardiac or neurological difficulties even after treatment . Some of these patients will experience chronic, lifelong joint pain from the damage caused by the bacteria and its direct and indirect stress to joint tissues. The earlier the antibiotic is started in the course of the disease, the better the patient's chances of a complete recovery."
Sounds like you got Zach in and diagnosed very quickly. That's a good thing