Pixar

Thanks for all the advice. We've started tethering the puppy to the coffee table or putting her in her playpen most of the time when she's around the older dog now so the chi x can get away if she needs to, and thus far it seems to be working. We also don't let the puppy outside at the same time as the older girl, and reward the puppy when she's calm and gentle towards the older dog.

We say 'ah!' or 'no!' loudly or smack a rolled up paper against the couch to make a noise as a warning when we see the puppy start to go for her, then if she does it anyway (she usually does, she's doesn't take much notice of verbal corrections) we usually put her in the bathroom for a couple minutes in timeout. We also sometimes just take her to another room or redirect onto something else if her harassment wasn't severe because our vet has advised us not to use timeouts too much because she might get used to it and stop caring.

About a month and a half ago, we got a female CKCS puppy who is now about 14 weeks. She's a really good dog in most respects, she can be a little stubborn sometimes, but smart, going well with training, picks things up quickly and is quite sweet towards us. But she can be very disrespectful toward our older dog, a female chi x. She jumps on her back, nips relentlessly at her all over at times, chases her when she tries to get away, deliberately slowly puts in her face right in the chi x's - and, this wouldn't be a big deal if the chi x didn't mind it, but she hates it. She's very anxious in general (on antidepressants) and gets quite scared of the puppy who is now about the same size - because of this she growls and snarls and snaps at the puppy, but she literally has no teeth to bite her so the puppy just ignores her. We're currently putting the puppy in the bathroom whenever she harasses the older dog but still it's impacting the older girl's quality of life, she eats more hesitantly now and seems afraid to go outside because it smells like the puppy. The puppy respects our male dog and our cat because they've both laid down the law, but the poor chi x can't do it, and we're not sure what else to do about it other than putting the puppy in timeout and making sure the older dog has time away from her.