Sigh. Anyone know an older, male, mellow dog that DOES NOT CHASE CATS and will get along with my lonely corgi?
I'm guessing from your OP that you got this guy from a rescue (since you mentioned his former foster home). Does that rescue have a foster home with cats? If you adopted from someone like that, you'd know for sure whether or not the dog would coexist peacefully with feline-Americans before you brought him home.
"We're only trying to understand what you want, people. If we're not supposed to actually lunge at you, you need to name it something else." - Dear Murray