Yes, my girl will not allow any other dogs near me. It's too bad because it means she cannot handle living with any other pets, and she would have loved the company when I'm at work. I tried training her, but I was not successful. I tried researching how to manage it, I read books on resource guarding and aggressive behaviour, asked advise from more experienced dog people etc.
I moved in with a friend at uni and her dog. The dogs were excellent friends so we thought we could train away her little "jealousy issue", but unfortunately it did not work out. I think it's a form of resource guarding where we are the resource. My dog eventually started guarding things and spaces around me in addition to me. Never an issue with people, but she will chase away even her most favourite doggie friends if I'm in the room. Our dogs would sleep together on the sofa and be friends all day, but the second I walked in the room my dog would turn on the other dog.
My dog has always been easy to train and we kept the peace most of the time by giving her a command before she got angry with the other dog (like "lie down" or anything to distract her before she tensed up), but it was hard work having to be one step ahead of her all the time. I do think we are a worst case scenario though. I know people with similar problems that have managed to work through it. I'm sure you can get good advise on here, not sure I'm the right person to give it
A good start could be having the dog wait for permission before jumping on furniture for a cuddle with you. And generally having rules and routines to follow. I think dogs that resource guard are insecure and if they know what is expected in a situation they are less likely to get triggered. But it is tricky because you want to do it in a positive way and at the same time not let them work themselves up. One thing we did was have both dog wait before being allowed to do things that could cause problems. They had to sit and wait for their food and not go over to each others bowls. They had to be called onto the couch one by one so my dog did not feel that she had to control the situation.
My dog is obedient and a lovely happy cocker, but this issue with her guarding me is something I'll admit I have no control over. But like I said, we are the worst-case scenario. I'm really just sharing because I was embarrest about it for many years and I want others to not have to feel like they are alone if they have experienced it. Not expecting you to have anywhere near the same severity of the issue at all