like a dog with a bone

alternative like a dog after a bone

1. informalnot comparablesimileStubborn and tenacious; persistent; relentless; dogged.

   I was like a dog with a bone, I wouldn't let go.

   1932, Louis-Ferdinand Céline, Ralph Manheim, trans. 1982, Journey to the End of the Night, page 67

   2 more examples

   Despite my determination to put the question off, my mind, or sub-conscious mind, like a dog with a bone which it refuses to drop in defiance of its master's command, went on revolving it.

   1918, William Henry Hudson, Far Away and Long Ago: A History of My Early Life, page 328

   Wilmer Lee was like a dog with a bone — he just wouldn't let Mr. Mooney rest in peace.

   1994, Truman Capote, In Cold Blood: A True Account of a Multiple Murder and Its Consequences, page 152

   Synonyms: like a bulldog with a bone