ive had yorkies for over 22 years first one when i was 8 and my mum use to foster for the rspca so we had allsorts of dogs in the house and he got on well with them all, then when i got scampi and sasha they had 2 pups which i kept who are tye ans zac, my mum had 3 gsd and i would stay with her with my 4 yorkies they all got on really well, (lucky) who was one of my mums gsd loved sasha to bits and thought she was her puppy and when sasha gave birth to tye and zac she sat there watching and then helped look after them. a few years later when my mum died she only had one gsd left so i took her home with me and my 4 yorkies and they all lived together fine.