Looking for some advice. We are getting a golden retriever puppy in 3 weeks time - my dsis has 2 yorkshire terrier/jack russell cross dogs (older puppies, around 9 months) and is keen to get them all together as soon as possible. I think she is concerned that our dog will ultimately be a lot bigger than hers and she wants them to first encounter him when he is small. I am concerned that her dogs are not particularly well trained and, whilst they are very sweet, they are still very bouncy and mouthy, they have no recall and she allows them to jump up. I think she made a mistake in getting 2 of them together as puppies and she is now aware of this, but obviously can't change it now. I am concerned that they will frighten our new puppy with their exuberance and general naughtiness! Any advice regarding the optimum time to introduce them and how?
Just to add, I am aware of my sister's mistakes with her puppies and fully intend to properly train and socialise our puppy. Also, she doesn't have dc yet so the puppies are her BABIES and she is the equivalent of pfb with them (for e.g. - puppy jumps up and nibbles on ds's (age 3) face, ds pushes puppy away, ds is told off by dsis, puppy allowed to get away with it, dh bites his tongue…….).