Potential damage from using a collar, and advantages of a harness.
As shown in the infographic, made by Fabrizio Giammatteo, several scientific studies show that the collar may by harmful for dogs. Among the different models the most suitable is the H model, as long as it is worn in the proper way.
Pet levrieri suggests Haqihana harnesses, available on their website: http://www.haqihana.com and in the events organized by us.
Haqihana specifically designed a harness for problematic sighthounds, who may need a higher safety level.
The original picture can be downloaded from this link.