My bitch is just shy off 14month and she's on her 8th mate!! I know what you mean about the old stuff , f*****g pissed off with it!
Don't give up mate , i was like you after her last big one , she'ed ran in to stock fencing and split right up her leg and i was going to smash my lamp , but its hunting lad!
wash her cuts out 4 times a day with warm salty water try some honey on a night time!
worked for me after the last time, had her back running in two week!