Up until now I have been using Stronghold on both the dog and the cats every month.... it may be effective, but it's not cheap!
I am thinking of changing to drontal tablets for both, for the treatment of worms (every 3 months)... and maybe frontline spot on as a flea treatment?
What do you all use on your dogs/animals?
(edited to add, I use the respective dog and cat versions of products - not the same for both, unless it is a dual species product, e.g panacur)