sorry... but if you are asking for a private ambulance... to compare with....

only one ambulance will come to you incase of any trouble. only hamad hosp ambulance, they have a complete equipment to take of you.
... there is also qatar red crescent. who works not for 24/7 duty. but they will be available in some events.... like sports event.... and of course they are visible in sealine resort every weekend.
... some other clinic or hospital has a ambulance but they don't cater a call from 999. if i'm not mistaken... only for a private calls.

good luck