ACK!!! Puppy-itis! He's GORGEOUS!

Does Foster bark only when he's being protective of your home, or is he also "mouthy" during playtime and/or when he's happy and excited? Eli, like lots of Aussies, is VERY vocal when playing and getting wound-up, so that's a good time to try out the training words and signals (if you can be someplace besides your apartment!). Or if that's just not feasible I'd say the citronella collar is the best bet, although I've never actually tried one.