Often, subtle problems can be missed by even the most diligent pet parents because our critters can not communicate with us and do not show pain in obvious ways. (riversidepet.com)
For reasons we have discussed, animals show pain in subtle ways. (sunnysidevetclinic.com)
Because dogs and cats show pain differently than humans do, a lot of people have concluded that animals don't feel pain like we do. (sunnysidevetclinic.com)