The vet put a 'lampshade' (proper term: Elizabethan Collar) around my neck after sterilisation. It was rather painful and I bled a little at the wounds. I wanted to scratch and bite the stitches but the 'lampshade' prevented me from doing so. I hated it. It was so annoying and it got into the way while I was eating. When I bumped into furniture, it made quite a lot of noise and I think it irritated everyone at home a little. :-)
I also rested a lot after the operation. You can see how skinny I was then. All skin and bones and 4 tiny stilt-like legs.