Sorry, I do not know what to do in this situation, except to quickly contact every pit bull group or animal advocacy group you can find to ask them how you can fight back. I'm afraid that if quick action isn't taken, your dog could soon be put to sleep.
Don't be stopped by that rude official. Their goal is to get you out of their hair as quickly as possible. Their mode of operation is to behave like a _ _ holes, hoping you will be intimidated and frustrated and just give up.
Get help fast. Don't let them win. Your dog needs you now.
Is there a local vet who knows your dog and can intervene to vouch that your dog is not a pit bull?
Maybe the Humane Society of Aurora can help advocate for you and your dog. They seem to be used to dealing with the local animal control:
Here is a pit bull group in Denver. Maybe they can advise you:
^ The following blurb came from that website:
Do you have any friends of the family who are lawyers and can intervene on your behalf?
Here is a random pit bull group's contact page I found:
I have no personal connection to any rescue group, but I have seen many youtube videos on pit bull interventions from the New York Bully Crew:
www.nybullycrew.org
All I know is those guys look tough, knowledgeable, and good hearted in their videos. If you need someone to tell you how to fight an injustice, New Yorkers are culturally a good bet.
Get help from someone quick. Fight for your dog.
Don't be stopped by that rude official. Their goal is to get you out of their hair as quickly as possible. Their mode of operation is to behave like a _ _ holes, hoping you will be intimidated and frustrated and just give up.
Get help fast. Don't let them win. Your dog needs you now.
Is there a local vet who knows your dog and can intervene to vouch that your dog is not a pit bull?
Maybe the Humane Society of Aurora can help advocate for you and your dog. They seem to be used to dealing with the local animal control:

Humane Society of Aurora
The Humane Society of Aurora protects and advocates for homeless animals, provides resources for pet owners, and educates the community about responsible pet ownership.
www.humanesocietyofaurora.org
Here is a pit bull group in Denver. Maybe they can advise you:
Team Pit-a-Full is Pit Bull Advocacy and Pit Bull Awareness
Team Pit-a-Full is a collection of Information about Pit Bulls, Staffordshire Terriers, American Pit Bull Terriers, Staffordshire Bull Terriers, Bully Breeds, Breed Specific Legislation, "BSL", Breed Ban, Breed Restriction, Dog Safety, Dog Training, Breed History, Dangerous Dog Laws, Dangerous...
www.teampitafull.org
^ The following blurb came from that website:
Do you have any friends of the family who are lawyers and can intervene on your behalf?
Here is a random pit bull group's contact page I found:

Contact Us
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www.pbrc.net
I have no personal connection to any rescue group, but I have seen many youtube videos on pit bull interventions from the New York Bully Crew:

Contact — New York Bully Crew
All I know is those guys look tough, knowledgeable, and good hearted in their videos. If you need someone to tell you how to fight an injustice, New Yorkers are culturally a good bet.
Get help from someone quick. Fight for your dog.