Antique "Dog On Guard" Framed Print

This is a framed 9 x 13 antique print of the "Dog on Guard." A Saint Bernard standing guard over a sleeping girl on the beach. This print belonged to my grandparents. I am 57 years old, and they had it for as long as I can remember. I am unsure of its age or significance, and I have not researched it. I am only asking what it is worth to me. Glass and wood frame, both are intact.