We Have A 16 Year Old Australian Shepard, Panda. Would It Be Ok To Get A New Puppy?

Panda has helped raise two children and a kitten and we love her very much. She is in OK health but spends most of her time sleeping. She occasionally wants to play, especially with her cat, but is usually inactive. We wanted to wait until she passed away, but hopefully that won’t be for awhile and I do not want to even think about that. We would like a puppy to take on walks, train and play with but we are concerned about making Panda jealous. Odd as this sounds, I was thinking Panda might like having a puppy she could pass on her knowledge to. I have been researching small breeds so if they jumped on her it would not hurt. Also, a breed that loved other dogs. I have come up with either a Havanese or a petite goldendoodle. Does anyone have advice or comments to share with me on this. Thanks.