In a Word

groak
v. to stare at a person longingly while he is eating

“Did you ever hear of a dog before who did not persecute one with beseeching eyes at mealtimes?” wrote Elizabeth Barrett to Robert Browning in 1846 of her celebrated dog Flush. “And remember, this is not the effect of discipline. Also if another than myself happens to take coffee or break bread in the room here, he teazes straightway with eyes & paws, … teazes like a common dog & is put out of the door before he can be quieted by scolding.”