dear junie
braingonebad is SO right. Timing is everything so you have to "catch the first sign of agression and yank and say no right there, and do it every time".

Think about this. Doing it every single time. I can't imagine that you have the time. If people tend to ignore your needs (not picking up after themselves very well), dogs are no dumber on issues of authority, and if they can get you to let something slide, they will. So, I have to imagine you just don't have the time to do what is necessary to do. The average Peke is not the quickest learner in the dog kingdom, so it may be necessary to 'remind' him every day for the rest of his life what is not acceptable and indicate what IS acceptable. Don't assume he's human and doing it on purpose, he's not THAT smart.

If you can find instances where you train by praising him/her for what is acceptable, you will succeed far sooner than if you have no option but to spend all your dog time telling him waht is NOT acceptable. Do you really have the time and energy to never let it slide? That's what people count on, including dogs!

The only thing I can add to braingonebad's excellent, down-to-earth counsel is that you need to be firm in a kind way. You need to make life LESS miserable for them if they obey your requirements, and do it with FULL CERTAINTY that they CAN do what is right, and all involved need to have FULL CERTAINTY that you feel this way. They need to know that you are sure they are capable of making you overjoyed to be living with them and they need to know that you will never rest, not a single second, until you are overjoyed by how they are to live with. Without that double certainty, nothing will change. They need to have as a carrot-on-a-stick type reward a taste of how happy you can be to be to live with; this is how you inspire them. They also need the stick-as-punishment where they know that they are never going to be left in peace until they live by your needs since you are the boss. This is called by trainers and psychologists "no other options".

Only when animals realize that there really is no other option will they change a habit that requires effort. And they need to think it's worth it, so tell them (if human) that you hope they don't move out if that's true. This is what we do with dogs and toddlers to save their lives: we teach them that "STOP" means stop, since they could be on the other side of a busy street, about to charge into traffic to come greet us. Since teaching them a very few of these critical 'ovey then think about it' commands, we know we can one day save their lives if necessary.

Good luck with your kids (both human and doesticated)
Jane