It can be both weak and excessive since the intensity of abdominal pain increases and lowers. (bebezclub.com)
As pain increases, the owner may witness the cat trembling or shaking, or even thrashing about if the pain is extreme. (petsinlive.com)
The evolution of bone cancer pain in dogs parallels what occurs in humans, with the frequency and intensity of pain increasing over weeks and months. (sciencedaily.com)