Wow, that's really tough about your Cav. What a shocker that must have been.
I share your concern about chemicals. We've wrestled with that question since we live in an area with a lot of ticks. At the very beginning of Spring, we found one tick on Buddy and used a very similar removal twister. It took a little patience, but the thing finally let go. Then we put in in alcohol so we could identify it. Don't know if our ticks are the same as what you guys have, but
here's a great site for ID'ing the little buggers.
Whereas many parasites, like fleas, are more prone to attack less healthy dogs, ticks are attracted to CO2 so that makes them more difficult to avoid. If you want to try something natural and non-toxic, Dr. Pitcairn and others have recommended herbal formulas containing eucalyptus. After our first tick this Spring, we started using Spa Dog's Eucalyptus Natural Flea Control and have had no problems since. The title says Fleas, but
their website says All Natural Flea Dog Tick Repellent.
I've been very happy with it. Buddy goes into dune grass over his head, which I know has ticks in it, and we haven't found a tick on him since we started using it. Also, sometimes when he comes up from the beach he starts itching and biting himself like something's on him. I don't see anything, but I spray him with this spray and he stops. There's also a
pretty happy testimonial on Amazon's site.
Those tic twisters are a great idea. We only had to use it once, but it really was nice because it not only safely removed it, we had the intact thing to then identify it. Good item to just have on hand.