Ticks are seasonal and in Victoria we tend to see higher numbers of pets contacting ticks in the winter months of Jan-Feb and then in the summer, generally, June through August. On Vancouver Island, ticks may carry Lyme disease caused by a bacteria Borrelia burgdorfi. The intermediate hosts for the Pacific Tick are mice, rabbits and alligator lizards. Deer, humans, dogs and cats are often the final hosts. Very rarely dogs in our area may contract two other tick vector bacterial infections, Ehrlicia and Anaplasma. Ticks basically infect animals with these disease when they feed on hosts, so it is best to use products which repel or kill ticks quickly..these include Bravecto, Revolution, Advantage Multi and Adantix. Rarely do ticks spread from one pet to another in a household.