I honestly don't know if certain harnesses are accident proof - 
 
here's the post about little Mocha - 
http://www.yorkietalk.com/forums/sho...ighlight=mocha it's very very sad 
 
 
  - She's still a member and if you wanted to ask her what type I think enough time has passed where she wouldn't mind -  
and my vet also stresses no collars - back when I first got Chanel he ran thru all the 'to watch for' things when having a small breed dog - one was reverse sneezing and only using harnesses to keep pressure off their necks.  My vet's great about educating people - which is what people were doing in this thread....I'm by far NOT an expert in yorkies but it stands to reason their tiny necks could easily be damaged from a collar