I tried this on him today
http://www.amazon.com/COMFORT-CONTR...P4C8/ref=sr_1_2?ie=UTF8&qid=1328051581&sr=8-2
and it fit well! It still slips a little, but not much. His chest has gotten broader, and I think that helps with the slipping.
He wears size small, but if you want that it's much cheaper in pet stores - Petco has them or something similar to them (I tried it on in a locally-owner pet store).
http://www.amazon.com/COMFORT-CONTR...P4C8/ref=sr_1_2?ie=UTF8&qid=1328051581&sr=8-2
and it fit well! It still slips a little, but not much. His chest has gotten broader, and I think that helps with the slipping.
He wears size small, but if you want that it's much cheaper in pet stores - Petco has them or something similar to them (I tried it on in a locally-owner pet store).