Deep-chested dogs, including boxers, are more likely than others to develop bloat, in which the stomach fills with air, and stomach torsion, in which the stomach twists around itself. Together, these conditions are called GDV. GDV is a medical emergency requiring immediate veterinary attention. Some classic signs of GDV include unproductive attempts at vomiting, a hunched over posture, an obviously distended stomach, salivating, and pacing. However, dogs may not exhibit all or any of these symptoms. If you are at all concerned that your dog might be experiencing GDV, do not waste time in getting to the vet, since without rapid veterinary intervention, GDV can kill your dog within hours. Although it’s not understood what causes GDV, it is generally recommended that you avoid feeding your dog immediately before or after exercise to reduce your dog’s risk of suffering GDV.
You can read more about GDV at The American Society for the Prevention of Cruelty to Animals.