Hello and welcome!
Here's a website where if you type in your post code, it will list the vets closest to you:
http://www.vet-look.ch/
As for recommendations wise, it really depends on where in Zurich you live. I used to bring my dog to Dr Buchler in Hongg. Dr Buchler is very experienced, extremely professional and a highly skilled surgeon. He did my dog's castration and removal of an extra toe with minimal scarring (in fact, I cant find any!). His details are:
Dr. med. vet. Emil Büchler
Hohenklingenstrasse 45
8049 Zürich
Tel. +41 (0) 44 341 07 07
But I've recently moved and our local vet is now:
Dr. med. vet. Lorenz Jöhr
Allmendstrasse 4
8700 Küsnacht
Tel. +41 (0) 44 912 04 04
Dr Johr also came highly recommended by a fellow EF member and I have to say, I wasnt disappointed. He speaks excellent English and when I brought my dog there for shots, he was very patient and great with my dog who is usually wary of strangers. I've not much experience otherwise with vets here in Switzerland other than shots and castration, as mine's a young dog but I am sure other members will come along with their experiences soon enough.