I have to say at least some animals do have visual cues that remind them of "stigmas" regarding pain. I've been giving my cat subQ fluids every night the past 10months, for his chronic renal failure and he hates it (it hurts more than it used to unfortunately). When he sees me get the fluids bag out, his eyes get huge and he tries to hobble to a hiding place as quick as can be. They know when something can cause pain from their memories, just like us.
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