Oh man, same thing happened to me a couple weeks back, it was so vivid. Was in the middle of a stress dream and out of nowhere my old dog hops right up to me. In my dream I just started bawling, it was such a flood of relief to see her, and at the same time I knew I was dreaming and was so desperate not to wake up. I lost her very suddenly in 2017 and even 8 years down the road I still miss her ❤️