Worried about your dog's mental health? Trainer reveals surprising reason why they may be feeling scared or anxious (and what you can do about it)

Sad brown dog lying on the floor.

Unfortunately, sometimes dogs can experience traumatic or stressful events — just like humans. 

If you have a rescue dog, this might be the case, but even if your dog has had the best parents for their whole life, with plenty of the best dog toys to play with, they might still have been hurt by another dog on a walk, for example.