I have three antique portraits of cm coolidge dogs playing poker; "The Waterloo", "Post Mortem", "A Friend in Need." I was wondering with pictures of them, would you be able to date & appraise them. :)

With prints, the dating of them would be difficult, unless there are any other identifying things as to the manufacturer of the prints listed on the prints themselves or the frames, if there are frames. As far as a possible monetary value, yes that is possible here.

If you are looking for an appraisal for insurance purposes or some other reason where you really need an official appraisal, then it would be best to take them to someone who can view them in person and give you a written appraisal of them.