I do get fed up with saying this - there is no such thing as food expiry dates. The date is always "sell by" or "best before" They're there to protect the store against being sued, not to protect YOU. And dates are always set far too early because of this. So I am a very happy date-ignorer! Food doesn't suddenly go bad on one day.
Just use your common sense. As with any food, does it smell, look or taste bad? If not, go ahead. Especially if you didn't open it until recently. That's how we always managed in the days before dates on food. The actual salad vegetables didn't come with dates on them, did they? Or even if they did because they were packaged, YOU can tell if they're still good or not.
Some food degenerates just with time, other food doesn't so it all depends on how recently you opened it. Oil and vinegar especially won't be a problem. And looking at the ingredients of Kraft Catalina dressing, I can't see a problem with those.
Just out of interest, the ultimate on this is cans, which have been shown to be safe decades later. They were invented to solve a problem in the British Royal Navy - on long voyages, they used to lose more sailors to "off" food than actually died in battle. A Frenchman invented a way of preserving food in glass bottles, but glass breaks so ideally you want something better, and William Donkin came up with cans. Put food in a tinplate can, cook it in the can and then finally seal it, and you have virtually everlasting food that just needs heating up. The navy death rate plummeted after they started stocking up on cans.
I just mention this to point out how much it matters how long ago you opened the bottles of dressing. If you only opened them recently, they will have been protected from bugs and germs until then. And refrigeration is a huge help too.