Shroedinger’s cat is a paradox, but what does Pavlov’s dog bring to the joke? There’s no mention of bells or operant conditioning or anything like that. It seems like the “joke” is just that they’re both animals related to scientific concepts
I did end up researching Pavlov after posting and whether he had any famous paradoxical discoveries. This joke was copypasta from a submission site I am afraid, lol. They are doctors, a pair of docs.