I have this problem to with a ten month old border collie, he only needs to see a dog int he distance and he starts going crazy, barking, rearing, lunging and spinning round, if he gets close enough he will bite.
He now has to be muzzled when out, i was hoping to do agility but not sure any clubs would tolerate him, puppy class made him worse so im not sure agility classes would be ideal for him, good luck i know its so frustrating having a dog agressive dog let me know how you get on
