I post a lot on Globalpaw, its died down quite a bit though, not a lot of veteran members left.
I used to post several times a day on PetsHub (An all animal forum) but that forum is a baron wasteland now, only about 10 members, probably not even. And a few of those members don't like me cause I don't sugarcoat everything. But I still post there occasionally.
I am also a member of a dachshund forum, but I mainly lurk and post pics there.
And Goosemoose.com, my favorite rat forum and the only one I am on actually.
I have registered with a bunch of other forums, introduced myself and that was it! Don't have time to post on those, just stick with Chaz, Goosemoose, and Globalpaw.