Oh!Goodness!
Some years ago I used to collect for the RSPB door to door, properly sanctioned of course. I put envelopes through doors near where I lived & then went back to collect them a few days later.
Knocked on this particular door & a woman opened it, she was holding by it's very solid & strong collar this huge dog. She saw what I was there for & let go of the dog & turned to get the envelope. Dog & I eyed one another. I nearly wet myself, then it leaped at me put it's paws on my shoulders & licked my face.
I managed to get it to sit & petted it. Such a daft soppy mutt.
I think it was a Rottweiler, looked like one, but I thought bigger.
Woman gave me the envelope & got the dog in by grabbing it's collar & then I left. At that time I had never seen a dog like that. Sure gave me a fright too.