As with humans, the most obvious symptoms of cancer include the presence of a lump, swelling, a persistent wound and abnormal bleeding. (cuteness.com)
The most obvious symptoms of a flea infestation are pets scratching repeatedly, grooming themselves excessively, or biting their skin. (pesticideresearch.com)
A cat may be ill for a period of time without showing obvious symptoms such as vomiting or diarrhea. (mycoloradogazette.com)