well if i had to pick a special dog from all the dogs i've had over the years it would be Tyke a collie/bull/greyhound which i still have and use now.  
he never fails to impress me,takes all quarry with ease,rarely missing anything,a dog i can always rely on to do the buisness day or night. 
in his first season he caught and killed 21 foxes before he missed one,he's taken loads of roe daytime,with 3 being his personal best in a day which he's done plenty of times,and 4 roe,3 foxes (amongst other things :ph34r: )being his best lamping tally single handed. 
hopefully i'll still have a good few