Dolly also lost all interest in other dogs at 2- virtually overnight! I had worked so hard on her recall as she was desperate to greet anyone and everyone, and then she suddenly started ignoring them!
She still walks past other dogs without so much as a glance in their direction, whether she knows them or not. Another cocker might get a brief wag of the tail, but that's about it.
She doesn't generally tolerate puppies, but will usually walk away from them if she can. If she can't escape because the puppy won't leave her alone she will give a low growl- but I'm afraid I tend to gently move offenders away from her if the owners don't, so she doesn't have to tell them off herself.
She prefers people to dogs, and if someone stops to fuss her, she will happily sit at their feet for ages!
I also have a rescue puppy (who Dolly does actually play with) who is still desperate to greet every other dog and is currently on a long line, but the recall is coming on a treat- she actually returned to me of her own volition today before I called her as she spotted her cocker friends on the field. Mind you, she shot off like a bullet from a gun when I gave her the "free" command a few moments later!