how do I make my dog sit and stay still

train him. get doggy treats and train by puttng the dugs butt into a sitting position when you say “sit” and try it over and over. when you feel like he needsa reward, guve him the treat

put a treat in your hand, place it in front of the dogs nose and slowly move your hand up over the dogs head, (the hand with the treat) at the same time say “sit” when the dog back up it will sit. when the dog sits give the treat, repeat this.

for stay PUT your hand up in the “stop” position. Tell the dog to stay, when the dog does what you want, give treat. Don’t expect the dog to stay to long at first, reward after just a few seconds of stay, then each day make it longer and longer

Don’t ever push down on a dogs back, you can cause them injury

im not sure about staying still… but to teach your dog to sit, get a treat in your fist and your dog will smell it and try to get it after a few seconds push its lower back down while saying sit (not too forcefully) until it ends up sitting, then praise it and give it the treat keep doing this until it gets the idea and sits down on his own when you tell him to sit :D

Hope this helps :)