3 months ago my dad got licked by a stray dog on his leg where he have eczema and skin cracks now he have sore throat any chances of rabies?

Unlikely: This seems highly unlikely given the scenario that you described and I would suspect that the area where the dog licked and sore throat have nothing to do with the dog licking your father. However, I wish him the best of luck and perhaps he should see a family physician or dermatologist to get it evaluated further

Rabies vaccine: According to WHO guidelines thus is category 2 exposure, licks on non intact skin , hence he needs a anti rabies vaccine .consult your physician.

No chance of rabies: Fortunately, there's no chance of rabies. Rabies takes hold sooner than 3 months after exposure and a stray dog that licks isn't exhibiting rabid behavior. Dogs with rabies bite, not lick.