I just adopted a five year old Weimaraner named Kai from a woman who no longer had time for her four days ago. She was very sweet to my three year older daughter and I after about five minutes of being shy. I also have a ten week old puppy and a six year old neutered male, both golden retrievers. Kai is also spayed. She and my six year old golden growled at each other a lot at first and still do occasionally. They are always supervised and I am easily able to correct this with a firm "No" and sometimes a nudge if needed.
Beau has never been allowed on the furniture, and neither was Kai at her previous home, but when she decided to get on the couch I allowed it because I liked the cuddles. I allowed Beau to join us. Two days later, Kai took my spot on the couch and when I asked her to move she growled and showed her teeth. I stopped allowing her on the couch after that but have had her growl and snap at me for other things and almost bite me when she wanted my food. Please help.