If a dog steps in cat urine or feces can it pass feline leukemia to a cat indoors?

I have several cats outdoors. I'm concerned that if my dog steps in their urine or feces and drags it inside the house (say on the kitchen floor) and my indoor cats step on the same areas and then clean their paws that they could get feline leukemia from an infected cat outdoors. I know that the virus dies within two hours outside of the cats body. To me it still seems plausible? I have had two cats that have always been indoors (4&7) and they both died of feline leukemia. I have a dog as well and it was shortly after getting the dog that the cats both got sick and died within 2 months of each other.