This could be pain, although most dogs in that much pain won't walk around very much. It is more likely to be the dog signalling submission and fear/anxiety in general. A professional dog trainer may be able to help you address this so your dog is less fearful.
He is obviously scared. When a dog holds a tail behind its legs then it is scared.
When a dog runs away from something in fear (usually after a fight), it will tuck its tail between its rear legs so its tail can't get bitten off. This is the origin of the phrase, so if someone runs away "with their tail between their legs", then they just lost an argument and are backing away.
They put their tail in between their legs
when it wags its tail, it means its happy, and when its tail is still it means its bored, but when its tail is in between its legs it means its mad.
The cast of Tail Between My Legs - 2012 includes: Arthur Grob as Boy William Grob as Bull, Sheep, Chickens, Jessie
by winning it, or running away with your tail tucked between your legs.
One common indication is the tail between the legs.
no.dogs communicate by using their body(tail,eyes and ears) ex:they are scared when their tail is between their legs,happy when tail is up
Because hes scared
They put their ears down and/or put their tail between their hind legs.
A cat tucks its tail between its legs when scared or threatened as a way to protect itself and signal submission. This behavior helps the cat appear smaller and less threatening to potential threats.
A coyote.