Between about six months and two years many dogs seem to forget everything. It is a phase, and patience gets you through it faster.
Adolescence brings hormonal changes, more independence and a growing interest in the world. A recall that worked perfectly can disappear, and some dogs go through a new fear period. Large breeds often mature later than small ones.
Go back a step in training and reward generously again, use a long line where the recall is unreliable and avoid situations where the dog can practise unwanted behaviour. Keep routines predictable and make sure the dog gets enough sleep.
Sudden aggression, strong fear or behaviour that worries you is worth taking seriously early. See your vet to rule out pain or illness, and look for a qualified trainer or behaviourist who uses reward-based methods.
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