How do I get my puppy to stop jumping on my older dog?

Whenever my senior dog is walking around the house or outside the puppy with run into her on purpose and cause her to fall over. She sometimes jumps on her back and the older dog hates it. The puppy understands “stop” and “no” and “get down” but I have to keep telling her this everyday. She is a two month Pitt lab mix. The older dog is an 8 year old Puggle.