There were some things I liked and some things I didn't. I didn't feel to strongly about this cartoon negatively or positively, I think it was just okay.
For one thing, the visuals. Overall they are well-done, simplistic and clean. Very basic, but I see that is the style you are going for. It looks good in itself. I kinda like the color scheme, everything's in sort of a duller shade. As far as animation and coloring goes, it looks like you understand what you're doing.
Script is good, I like the screenplay and dialogue you have here, but a lot of the time I kinda found it tedious and slow-moving. Also, the actual concept and plot I didn't particularly like, I mean he's annoying the other dinosaur, but nothing really adds up to anything, he gets annoyed, and then they both just sorta die... I dunno, didn't do it for me. But I like how it has a decent running-time, it's not overly short, or TOO long. Though I kinda thought it was just a little tedious is all.
Voice acting is great, I loved it. Especially the t-rex.
Overall, it looks like you know what you're doing when it comes to making a cartoon, with the script, getting good-quality audio, and being able to handle the style of art and animation you are attempting to accomplish, though that quality may be a little sub-par, to me, anyway. It wasn't my favorite but I in no way hated it. I'd like to see more from you, I'll just leave it at that, pretty nice job.