Dog Head Whistles, most dating to the 19th century, made of Ivory, Bone, Horn and wood. 
These were made mostly in Britain & france and used by Hunters, riders and Gentlemen when hunting was a common social event for the higher classes.
Other hunting related animal heads such as horses & foxes were used as well but dog heads were the most popular, serving as a "Gudget" at that times.
 Simmilar ones were popular as tops for walking canes and riding whips.
These whistles were also made of various metals , clay & later of polymers .                                                                           
                                                                        AmericanDog head whistle., USA
                                    
                                                                        Britain. Ivory.
                                                         
                                                             An early french example   18th cent. or early 19th century.

                                 
                                    Two dog head whistles;  Ivory, wood & a horn made one.



                                 


The above is a Dog head whistle made of bone, with a stanhope peeper. French style mouth piece.
This one was a whistle from Boston,  The English town
and shows tiny photos of  historic Buildings there.
Obvoiusly a cheaper version sold as a souvenier for tourists at the time.

Two more hand carved samples .
                         


                                                    Below a very rare  dated & stamped sample made by Dixon & Sons, The whistle was made in large numbers but stamped ones are ex. rare. the stamp is on the mouth piece,December 1864.
                                              

                                                                                                                                                                                                                                                  Pair of Ivory whistles.                                                                                               

Early British, Ivory dog head w. Glass eyes.

                                                             

                                                             
                                                                    above,  French ivory doghead.
                                     
                                                                  French , made of bone, 6cm, an uncommon shape.


                                                      Ivory Dog head whistle, C 1860, Glass eyes.
                                                      

                   Ornate Ivory Dog head whistle, Borzoi dog.
                  







                                                        
Pressed horn , Stamped with maker's intials, W. R. Simmilar ones were made by Dixon & Sons & Linegar up to late victorian era.


                                                       
                                                            A riding whip with dog head top.


 Whistle Museum, Notes  by A.Strauss, (All rights reserved).
Courtecy od Saltarbut http://www.saltarbut.co.il/ סל תרבות שטראוס 
and http://www.avnerstrauss.com/  אבנר שטראוס
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http://he.wikipedia.org/wiki/%D7%90%D7%91%D7%A0%D7%A8_%D7%A9%D7%98%D7%A8%D7%90%D7%95%D7%A1