Dog Mourns at Casket of Fallen Navy SEAL
Navy SEAL U.S. Navy Petty Officer 1st Class Jon T. Tumilson was among the 30 American troops killed August 6 when Taliban insurgents downed their Chinook helicopter with a rocket-propelled grenade. At his funeral in Iowa, his dog Hawkeye paid his last respects, walking up to the casket, lying down in front of it, and heaving a sigh.
I haven't read anything indicating Tumilson, who was 35 when he was killed, was a dog handler. This may be the family dog, although that harness has a military look. You can read more about this fallen hero here.
Here's a looping video of Hawkeye mourning.