Nicholson

Hi all I have just found this website and tis great. I have a 3 yr old patterdale bitch, i've had her a year, came from a resce home so no history. She is a great dog, no fear, and has caught a few rabbits, been down holes etc but i dont let her off the lead now cos she wont come back for hours. Then started attacking other dogs in park etc. She is better now and not so aggressive . Is she too old to start to rabbit /rat ? we live on isle of wight.