It means to continue something that started previously.
To make longer and to make shorter
In my experience Labs do not get mean unless they have endured prolong abuse in their early years.
Sos..Need help.
Radiation of foods, etc, to prolong freshness. Considered to be dangerous.
The adjective for prolong is prolonged.
A protracted process refers to a drawn-out or extended period of time it takes for a particular action, event, or situation to unfold or be resolved. It typically implies a longer duration than expected or desired.
prolong
By eating healthy you will prolong your life.
Don't prolong the agony, tell me the bad news now.
Regular maintenance will help to prolong your car's engine life.
Smoking does hurt your immune system and can prolong healing.
Avoiding going to the dentist with a bad tooth will only prolong the agony !