Yeah, they look cute but just looking at them makes my feet uncomfortable. They're probably only comfortable if you walk on tip toes, but human feet aren't designed for that.
I've never worn these but I can definitely see why they'd be uncomfortable. I do have a pair of thigh highs that have a paw pattern on them but it's just colored/printed it's not actually a raised/stuffed part like it is on the one in the picture. Also the ones I have are thicker, I don't like the really thin ones that much.
You can probably find them on Amazon but I'd recommend getting ones with the paw pattern as just a pattern on them instead of being raised up like on these since those will be more comfortable.