My 5 month old puppy has really gotten into the habit of jumping up and down on her back legs. If someone she loves walks through the front door she will get on her back paws and hop at them. Then will just stand there And balance at their feet. She's also massively into jumping. To be fair she's an extremely good jumper but it still can't be good for her as she does it on her back paws. I didn't know whether this was good or not so I googled it and it's apparently very bad for joints and spine. I would like to clarify I have never trained her to do this, she's done it on her own. I'd just like to know ways I can stop her doing this so she doesn't get any damage. Or an explanation to why she's doing this. She's a Chinese crested Powerpuff by the way.