i had the same problem with my Lucio i have found cute things on barkindogclothes, i also got him some of the sports hoodies from petedge. walmarts sometimes have the plain tees with cute saying and ive gotten him ots of cute ones there for lil 2.93 some say killer, barkeologist, food patrol, im the boss, no cats allowed, etc. also check on ebay. brooke's site has a boy section also. hmmmm i have to think where i got the rest of his stuff
good luck!