my GSD got tetanus about 5 mths ago.To everybodys amazement he made a full recovery and things seemed normal for a while but then his temperment started to change,he went from being confident,brave and friendly to nervous and slightly argressive to strangers.His behaviour seems to be getting worse even towards his mother and sister and sometimes my husband!!Has anybody else had or know of a dog who has had this?

Can anyone advise?

Sounds like he needs alot of love and positive reinforcement.  Maybe there are hormonal changes affecting behavior.  Best wishes,  Ann