Hi Tracy,
Potencies C and K are equal in strength. They are both C potencies.
What is said above about these potencies (different action) is incorrect.
Homeopathic Sulphur isn`t used to repel ticks, but only for the very tiny parasites such as fleas.
Sulphur in potency doesn`t kill any parasites, but only makes the skin of the animal (far) less attractive for them, so the dead ticks you mention are just a coincidence.
Non-homeopathic Sulphur (the yellow Sulphur powder) is sometimes said to kill ticks but I haven`t seen any proper proof yet. Would be a funny sight as well if we powdered our pet yellow all over time and again.....
.
Regular grooming and checking and mowing the lawns/pastures regularly, as I mentioned earlier for the horses, is still the best prevention and perhaps a safe tick repellent from your vet.
Also see :
http://www.k9web.com/dog-faqs/fleas-ticks.html (Scroll down to Ticks)
Also see :
http://www.lowchensaustralia.com/pests/bites.htm
Wim