Do Not Mess With Mother Squirrels
...or, at least, with their babies
But it appears to have underestimated its diminutive opponent, as the brave mother squirrel clearly has no intention of letting her baby become dinner and rushes to its aid by jumping on the dog's head.
After the whirlwind attack the mother squirrel springs free of the dog and rushes her baby back up into the safety of the tree.
The frustrated dog is left sitting forlornly at the base of the tree as its prey escapes into the upper branches
I am pretty impressed that the baby knows so readily to head up a tree, but I expect that is in fact a pretty useful adaptation, and not solely a just-so story.