This collar has been made with hounds in mind but also suitable for many other dog breeds especially those with slightly longer necks. The wide part of the collar helps to prevent damage to the most vulnerable parts of the dogs neck and also help prevent the collar coming over their heads, although this style is not fully escape proof.
All hound collars are made with adjustable buckles but we still suggest you measure your dog to create the best fit. 
Fits necks  34 to 43cm. If a diffrent size is required please let me know in the comments upoon ordering. 
All collars at thier widest are 38mm wide.