About 21 % are infected with tick-borne disease.
Therefore, the chances are 1 in 5 [about] that the tick you pulled off is carrying a disease.
2. Experts in Lyme Disease state that dogs don't get Lyme Disease [like people do]. Dr. Meryl P Littman [and I knew her well] felt that dogs rarely got Lyme disease. A very rare but serious problem from a Lyme positive tick is Lyme Nephritis, which is an autoimmune disease of the kidney tubules [vaccination for Lyme would increase the predilection for this problem] That's why I recommend that any dog who has tested positive for Lyme Disease do a routine clean urine test
once a year to check for protien, which is the first sign that Lyme nephropathy is present.
Do I recommend a month of Doxycycline for dogs who test positive for Lyme Disease with a C6 Antibody Test from IDEXX? I sure do. One major reason I do this is to help prevent that immune mediated glomerulonephritis in the kidney. I also give dogs a special homeopathic combination twice a week for
10 weeks or so to prevent complications.
But... the statistics don't lie........
Asymptomatic dogs who will never have a problem are at 95%.
All that said, 95% of dogs who test positive for Lyme disease are not affected at all by the
disease. Let that sink in. Check out this peer reviewed publication.