Strained and injured muscles can benefit from a massage. A massage can reduce pain and inflammation in your dog’s lower back muscles, increase circulation to tissues and injured areas which increases oxygenation to those tissues, and increases production of synovial fluid to lubricate joints and provide flexibility in vertebrae, which will increase joint efficiency, making your dog's lower back more resistant to injury and helping recovery of overstressed muscles.
If your dog is experiencing pain from an injury, or sore muscles from overcompensating for an injury in his lower back, a massage can feel good, as it relieves pain. Or, the massage itself can cause some discomfort, if sore areas are overstimulated or manipulated. Your dog does not know you are trying to help him with your touch, and may react by avoiding massage or even becoming aggressive towards you. Introduce massage to the lower back gently and slowly, to see what works for your dog and how he reacts.
Your dog's lower back is a critical support mechanism for your four-legged friend. Just look at the way your dog stands and you can see how limbs and abdominal organs are supported by the lower back. Injury and strain to this area are not uncommon, especially in long-backed dogs, or when injury occurs elsewhere and the lower back muscles overcompensate by taking up the slack and providing additional support. A massage to relax muscles in this area and increase circulation can benefit your dog's lower back muscles and keep them relaxed and functioning well, so they are more resistant to strain and injury. You can use your hand to locate and pressure out tense knots in the lower back, or apply gentle flat handed pressure and then cross fiber pressure to cause muscles to relax and improve circulation. Pay attention to your dog's reactions; if he shows signs of pain, ease pressure off, or move to another area. Remember your dog can't tell you what does and does not feel good, it’s up to you to pay attention to signals.