Boomer, an 8-year veteran of the sheriff's office, died, HCSO said Tuesday.
"It is with heavy hearts that we announce the passing of K9 Boomer," the sheriff's office posted on its Facebook page.
According to HCSO, Boomer worked with his partner in the field, Deputy Thomas, when the animal was 2 years old.
When Boomer retired more than a year ago, the dog's partner soon became his parent when Deputy Thomas adopted him.
"We will forever be grateful for his service," the Facebook post concluded.
In recent years, southeast Texas has been a breeding ground for heroic law enforcement animals. You can see additional examples with the stories below.
Freeport PD names new K9 after honorary officer who battled cancer
K9 armed with shiny new titanium teeth
Bloodhound leads deputies to suspected shooter in Liberty Co.
HPD officer T-Rex nominated for 'K9 of the Year' after losing leg