So I figured I'd ask here, where people see them in their home ranges - what is he? (I know that because he's a pet animal he could be any kind of mutt, and that's a good answer too, but if someone can look at him and go "definitely annectans, look at those sides" I'd be happy.)
From above:

Armstrong by Julian Rossi, on Flickr
Rostral:

Armstrong by Julian Rossi, on Flickr
Body shot:

Armstrong by Julian Rossi, on Flickr
Second body shot, showing more of the tail:

Armstrong by Julian Rossi, on Flickr