Pets can mourn the loss of a companion or their human family members in various ways, just like humans do. Some common behaviors that pets may exhibit when mourning include loss of appetite, decreased activity levels, restlessness, searching for the missing individual, vocalizing more than usual, changes in sleeping patterns, and exhibiting signs of anxiety or depression. It's important to provide extra comfort, love, and attention to your pet during this time to help them cope with their grief.