Describe the behavior of the following character in a sentence.
A feisty dog
The feisty dog is full of energy, always ready for action, and can be stubborn or aggressive at times.
Complete the following task based on the instruction and optional input provided.### Instruction:
Describe the behavior of the following character in a sentence.

### Input:
A feisty dog

### Output:
The feisty dog is full of energy, always ready for action, and can be stubborn or aggressive at times.