Question Summary:
Is permissible to used zakat money to treat injured animal?

Question Detail:

Is permissible to used zakat money to treat injured animal?

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu `alaykum wa-rahmatullāhi wa-barakātuh. 
It is not permissible to use zakat for the treatment of injured animals.
Zakat is to be paid to a humanbeing who is a Muslim and who is poor and needy as defined by Shariah. [1] 
And Allah knows best.
Mawlana Saeed Ahmed Golaub
Westmoreland, Jamaica, West Indies
Student Darul Iftaa
Checked and Approved 
Mufti Ebrahim Desai
daruliftaa.net