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There's Digimon Adventure which had a yellow dinosaur named Agumon with the power to breathe fire, that could turn into a more powerful version of itself, a red haired boy named Izzy & a girl with blonde hair (dirty blonde to be exact) named Sora who had a pink bird named Biyomon as her best friend. If not that, then there was also a television special from Brazil called Dogmons which can be watched here
which features a green Terriermon like character named Greendog that could turn into a more powerful version of itself named Dragodog, which when in this form fires a green energy blast from its mouth as it's main attack.
Possibly Dragon Drive?
Edited by ninjamitsuki2 Call me "Heruru Meruru". http://blue-star-above-me.tumblr.com/
Possible Dragon Drive?
Call me "Heruru Meruru". http://blue-star-above-me.tumblr.com/
i think it had these dragons that could turn into a bigger and powerfull version of themselves. The pilot had one of the main characters fight with a yellow dinosaur looking dragon that could breathe fire then had this blonde girl that had a pinka and green pet