Heads up! My dogs were at the vet today getting their vacs and three of five of them tested positive for Erlichia, a tick-born parasite that is also transmittable to humans (with ticks being the vector, not infected dogs).
It's treatable, but there's a 3% death rate in humans and probably higher in animals. Systems can be joint pain, low-grade fevers, upper resp infections and GI symptoms that don't respond to treatment. The vet said infected ticks seem to be in geographic clusters, and some areas don't have any, but nearby can be an area with lots of infected ticks.
Be careful with any tick bites you may have, and if you have an illness you can't shake, you might mention it to your doctor. Around here, most MDs don't regularly test for it.