(HealthDay) Jon Tumilson’s dog, Hawkeye, was an important part of his life.

And, as it turns out, Tumilson was an important part of Hawkeye’s life.

After the Navy SEAL was killed in Afghanistan last summer, more than a thousand friends and family attended the funeral in Rockford, Iowa, including his “son” Hawkeye, a black Labrador retriever who, with a heavy sigh, lay down in front of Tumilson’s flag-draped casket. There, the loyal dog stayed for the entire service.

Hawkeye’s reaction to his owner’s death generated a lot of buzz online and in the media. But it’s not unusual, according to pet experts, for some dogs to mourn the loss of a favorite person or animal housemate.

Grief is one of the basic emotions dogs experience, just like people, said Dr. Sophia Yin, a San Francisco-based veterinarian and applied animal behaviorist. Dogs also feel fear, happiness, sadness, anger, as well as possessiveness.

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