So I have a male Pembroke Corgi at 2 months, quickly approaching 3 months, appropriately named Thor. He's generally an active puppy, and had his fair bouts of running at full speed around the hallways. He doesn't bark too much, only when he's especially riled up, but the main problem is his biting. (And his potty-training, but I'll be trying many different methods that will hopefully work soon.) Since he's still small, his teeth are fortunately not sharp enough to break skin, and the worst he's given me is a bruise. When we first got him, his biting was horrid - He did not know when to bite soft in play, and would lunge at everybody's heels when walking, or just about anything that has movement and is at his eye-level, and would bite full-force. Then we did the timeout technique, and it worked for a time. He stopped lunging at everything and at most would just accidentally walk in front of people instead of biting heels, and his biting with people would lessen a lot. Whenever he bit, it was clearly in play and he didn't bite too hard. The exception was when you annoyed him way too much, such as touch his paws (to clean them), and when you pulled away he would bite down in anger, I presume. The main problem was that he targeted mainly strangers and guests, especially those with socks on. He lunges at their feet, and the person pulls away. I know that pulling away only causes the puppy to want to bite harder due to their instincts, but no matter how I always tell them to not pull away, they still do. It's frustrating, but I guess it's their 'instinct' too when something with pointy teeth aims at them. I do put him in timeouts consistently during these moments, but it doesn't seem to work as he goes right back at it as soon as he's out and sees moving feet. I have tried the 'yelping' or a loud 'ouch' method, but they do not have any effect whatsoever. Thor does not let go but neither does he bite harder, he simply ignores it completely. I've tried replacing his biting with a toy or treat, he bites it for at most about 5 seconds before deliberately going for tasty human flesh once more. I've done a whistle to get his attention everytime he did a bite (a regular whistle, not a dog-whistle) and it worked for a while, but eventually he started ignoring that, too. Also tried a bitter spray, but he either ignored or actually liked it and would start licking, before returning to biting. All of these I tried consistently. However, right now I'm trying a new method, and I need to know if it is correct. Whenever he bites, I would blow (very lightly) on his face, to distract and/or annoy him. At first he would stop biting in turn for sending me a stink eye and a huff, then would try again. I repeated the blow, and he jumped off from me with a angry-sounding huff and at times a growl if he was really into the biting, but it worked and he would back off and play with his toys instead. However, the thought of this method and the way he reacted in an annoyed manner made me feel that this probably was a bad way to deter him from biting. However, if this behaviour is just him not getting enough exercise, then it should be fine. He currently cannot go outside (As he has not had all his vaccines), but will be able to in a month. Did not mean to make this so wordy, but I needed to specify the ways he's been trained. I'd like to ask for some advice on this whole biting situation, so that he may stop targeting stranger's feet. Thank you!