I used to put flea products on both Tyler and Trinity because I was told I should to prevent heartworm. Tyler didn’t like it but Trinity acted like you’d put something horrible on her. She hated it and acted weird for up to an hour or more afterwards.
I probably used it for no more than a year before deciding the potential of them getting heartworm being indoor-only cats versus the problems she had with it outweighed the benefits and quit. I wish I’d never put the first dose on my cats!
It was years later before she had her seizures and several years after we’d seen her last seizures before she passed away unexpectedly after a clean annual checkup.
They suspected a heart or brain problem for her death and today I read this.