Adjustable horse halter
FIG. 1 is a side (either) elevational view of the novel adjustable horse halter; 
     FIG. 2 is a rear elevational view thereof; 
     FIG. 3 is a front elevational view thereof; 
     FIG. 4 is a top plan view thereof; 
     FIG. 5 is a bottom plan view thereof; and, 
     FIG. 6 is a perspective view of the novel adjustable horse halter in position on a horse. 
     The broken lines are for purposes of illustration only and form no part of the claimed design.