So, a while ago, someone (More Dakka) sent me a sketch art height scale which, having forgotten about for some time, I suddenly remembered I had, and I think would be of use for reference.

As you can see, Griffin is quite a bit taller than Gilda, and his griffin form is approx the same size height when standing. Back in 'Griffin the griffin' he remarked that everyone else looked so much taller after his first transformation, but that was due to him sitting on the ground, where as when he sits as a griffin, his head is at nearly the same location as standing, since quadrupeds just drop their rear ends, the head remains still.

Great monkey sprinkles! Nadene is tall! But yes, that's what I had envisioned for the character. In fact, many Bast (the name has been referenced in Through Feline Eyes) are this tall, though the average height does vary based on tribe, and from individual to individual. Growl is approximately the size of an average human, when standing, though a lot thicker. In this case, "I'm not fat, I'm just big boned." is accurate. Etch, on the other hand, is a fair bit shorter, around the size of Rover and his gang, as seen in the actual MLP episode, "A Dog and Pony Show".

Finally, ponies. Goodness, it really is "My Little Pony" isn't it? This isn't entirely accurate, as Twilight Sparkle and her friends, fully grown mares, are around four feet tall, and this diagram shows the larger as being around 3"3'. The foal, (on the right) is about the size of Applebloom, or maybe a little smaller than her, so this gives a good reference.

Princess Celestia (Not Shown) is even taller than Griffin (who is about the same height with both forms, but the griffin form on the hind legs means he can be even taller), not counting the height added by her horn. Luna should come up to his chest approximately.

So, I hope this clears up any misconceptions you may have about height ratios between species, and specific people. By the way, Zeta Chi is the size of an average wolf, he just has wings, which means that a couple chapters back, when they met, Griffin felt trepidation on seeing him, despite the fact that he basically towers over him.

Discord's size changes based on flabaloodle, a cosmic force that none understand, and as such, cannot be registered accurately. I also made that last part up.

Thanks again to More Dakka for sending me this.