After watching the episode, Through the Eyes of a Spiketail, I'll never look at Spike the same way again.
SPOILERS ALERT!!
Through a good portion of the episode, we get to hear everything from Spike's perspective. The shocking truth is that Spike may hardly ever speak real words through his entire life due to the fact that he can hardly understand anyone. The episode revealed that most of the words everyone else speaks only come out as some sort of dinosaur noise. (growls, grunts, roars, etc.) The only things he seems to understand when the others speak are either food or name related. Due to this mental disorder, he may never even speak a simple sentence.
The most interesting thing though, despite this little disorder, we hear his thoughts in perfect english. This little thing makes it rather difficult to understand just what is going on here. I really can't figure out this part.
One interesting thing, food pratically calls Spike, particularly new food, no wonder he can find food so well and is such a glutton.
Despite alot of stuff being explained about Spike in that one episode, I still find him a little difficult to understand. Now, I can only add feeling sorry for him. -_-