Sometimes, but it is beginning to depend on where in Colorado you obtain a marriage license. Colorado is one of few states that allows “self-solemnization”, which means you don’t legally need to have any
witnesses or an officiant. Having a witness (human or canine) sign your license is totally optional.
However, some counties are starting to change this policy to no longer recognize animal witnesses. As of the writing of this post in March 2025, Adams county in Denver metro was still allowing paw prints.
However, Denver county itself was not. The best practice would be to ask the county clerk’s office in person when you pick up your license. They will know the definitive and current answer to this question. If they tell you they will not accept a paw print, you can always ask to purchase an extra copy of the license. It won’t be “official” since you will never mail it in, but you can keep it as your own keepsake if you’d like. If you are going to include a paw print on your license, make sure to bring a non-toxic ink
pad!