Our expert says:
You don't say how badly the Scotty has bitten the puppy, but I presume not badly or you would not be considering integrating them. It is important that the puppy is not traumatised at this early age or her socialising skills will be compromised in future, so if you think this is affecting her more than just a discipliary nip would, then I suggest you re-home her and wait until your Scotty goes "to the happy hunting ground" before getting another puppy. However an adult or juvenile dog may be ok with him. If the bites are minor and the pup seems its normal playful self then perhaps it's wise to just allow the Scotty to discipline the puppy. The puppy will soon learn what she's allowed to do and what not. If things get a bit nasty then pick up the Scotty and remove him (rather than the puppy, who may be screaming to get your attention), but don't reprimand or punish him at all, as this will make things worse. He needs to associate the puppy with getting more attention, not less, and certainly not with being reprimanded. Always greet and feed the Scotty before the puppy and praise him (or even give him treats) for any interaction with the puppy, even if he growls. Avoid giving the puppy attention while he's around for a while. He does not "know he is wrong", but predicts your reactions and responds accordingly. Keep the puppy separated from the others when you are not supervising, if you are concerned about him biting again, until things are more settled and the puppy can defend herself.
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