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I am sorry you have this problem and ,as it has just started,do you know what has triggered it?
I would suggest that you sit with him where bikes are and reassure him as one passes by.I stopped Arthur by asking friendly bike riders if he could examine the bike (and them)and asked them to ride past him.Most agreed and he is fine with bikes now.
I strongly feel that as he will appear aggressive to bike riders that you keep him on a lead until you cure the problem.It only wants one person to complain that he had been attacked and your dog could be at risk.
this is an unusual one - have you checked the dogs eyes recently? He may not be seeing (percption and depth) as well and a bike and rider might look odd.
However you may try a little out of the box thinking. If you know someoen who cycles that the dog doesnt know pre arrange this person to cycle past you on a wide pathway. Have the dog on a long but loose line and as he lunges forward throw the long line at the cyclist who should make every effort then to cycle off with the dog.
The element of surprise should allow the cyclist to go forward a good thirty feet before the dog realises what is happening and then he can let the dog go.
cyclist should wear sensible trousers incase the dog does make contact initially. ths one works as I have seen a persistent "chaser" who now sits down whenever he sees a bike as much as to say "no way you are not stealing me"