[OwnedByJezebel]

Interceptor (milbemycin oxime) is for Heartworm, hookworm, whipworm, roundworm.
K9 Advantix II is for ticks and fleas.
Sentinel is the same as Interceptor, except it has an additional ingredient (lufenuron) that also covers fleas.

Apparently they are going to discontinue Interceptor, so you have a decision to make. Sentinel would cover everything under your current combo except for ticks. I don't know how bad ticks are in your area (I've never had one on my dogs) or if you could get something separately for just ticks. Or, if there would be a problem in using both the Sentinel and the K9 Advantix II together. Or, if someone else makes an equivalent of Interceptor with just the milbemycin oxime alone .....