A. If this is a new thing then it is most likely to be pain related, in which case a visit to your vet for a thorough examination and appropriate treatment is required.
If this is something that is ongoing, it is still wise to initially rule out pain by taking your dog to your vet, it could be a behavioural issue. Depending on the age of the dog depends on the course of treatment. A puppy should just require proper puppy training through puppy classes, these are run in most areas ask in your vet office for details. If your dog is 6 months plus I would recommend that firstly he/she is neutered. Unneutered dogs do tend to be more aggressive, neutering works well but needs to be done at a young age before the behaviour becomes a learned behaviour. If this doesn't work, it can be a more tricky problem to deal with and at this stage a professional trainer should be introduced. If it is an elderly dog and you've ruled out arthritis with your vet then it could be neurological a bit like dementia in humans. There are also some medications that your vet can give you that can help with some of the symptoms of 'dementia' but not cure it unfortunately.
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