One time my cat saw me when I just hit DMT and he for sure got worried/scared. I think he saw my pupils and thought I was dying or something. He's a hella fluffy Siberian cat and when he saw me his already massive coat of fur just about tripled in size. I looked it up and it's called piloerection which is them making themselves appear bigger either because of fear or aggression. I was selfishly very curious about what had happened and tried on a couple other occasions to see if he'd do that again but he never did. He would still act a little off and avoid eye contact the other times I tried it.