A wagging tail: what does it mean? I’ve filmed another short pet information video with the folk from Housemydog.com.
The main message is that a wagging tail doesn’t always mean that a dog is happy. It’s far more complex and subtle than that. The science of understanding tail wagging in detail is complicated, but this video will give you an instant brief update on what your dog is trying to tell you.
Please note that I am unable to answer veterinary questions in comments. If you have questions or concerns about your pet's health it is always better to contact your vet.