Comic book set in futuristic setting with reptilian humanoids

The title of this question is the best short description I can think of for this comic book/graphic novel series. I cannot remember the name of it, but for years I have been looking for it. I have tried googling, searching stores, and looking at online lists of comics matching that description.

The characters of the comic book were like reptilian and/or dinosaur humanoids, they were using what looked like modern day or advanced weapons. They were attacking a city/fortress and were also using large dinosaurs as beasts of burden to carry large weapons. This is the most I remember of it when I looked at it when I was younger.

Any feedback to improve my question would be great. Also, this is my first question so a comment with feedback will help more than a down vote!

Edit:
Not to narrow the search in the wrong direction, but I feel like it was a Dark Horse comic. However, I have searched lists of Dark Horse comics to no avail.

11/3/17: I have tried looking through the list of dark horse comics and I have found nothing. It is not Age of Reptiles, Dinosaurs for Hire, or Dino Riders. I will continue looking. The only thing I can really add: The artwork looked modern (2000s) and they were using guns. Sci-fi guns but not laser guns. I really hope someone can help find it!

2/1/2018: I scoured this list to try to find answers, but could not find anything. I remember they were using what seemed like ballistic guns but in a bigger sci-fi style. I also remember either large mecha or large dinosaurs carrying artillery. There may have even been a pterodactyl as the evil guy/boss. I had read it online and it was like a small sample or something. There were large beast carrying equipment and/or troop transports being shot at. I remember a few panels where the characters were all crouched in a hallway/alley way trying to get into the compound/city. The artwork was dark and the colors were saturated(?). This is all that I can remember. I hope that someone can help me identify this! I have been trying for years. Otherwise, what is a good source for searching for comic book/ graphic novel identification?

1/14/2019 I am unfortunately still searching for this comic book, but I really can’t remember anymore details about it, besides that it is not the the ones listed below. I have been searching on site like this with different filters to find it. Any help in reviving this post or narrowing my search would be greatly appreciated!

7/24/2020 And now my watch has ended. (Thanks COVID for providing the down time to search!)