Gorgeous enamel hound, modelled in high relief, almost three dimensional, in high carat gold, and then finely enamelled, and with a small bail gold, topped with silver set minute diamonds.
I'm not sure but maybe he is a fox hound? 
Backed in high carat gold.
 
Measures - 28mm x 28mm
weight - 4.9g
English circa 1870 -80
Excellent condition