Oak
For those who are struggling and fighting strongly to get well, or in connection with the affairs of their daily life. They will go on trying one thing after another, though their case may seem hopeless. They will fight on. They are discontented with themselves if illness interferes with their dutiesor helping others. They are brave people, fighting against great difficulties, without loss or hope of effort.
Keyword: Exhaustion, overwork, workaholic, fatigued, over-achiever
Human Indication: When you are exhausted, but keep struggling on. 
Animal/Pet Indication: If your pet keeps struggling although it is exhausted, never seen to quit.