Could be worms, but the firmness might indicate bloat. Here's some information on bloat.
Bloat is a very serious health risk for many dogs, yet many dog owners know very little about it. it is the second leading killer of dogs, after cancer. It is frequently reported that deep-chested dogs, such as German Shepherds, Great Danes, and Dobermans are particularly at risk.
If you believe your dog is experiencing bloat, please get your dog to a veterinarian immediately! Bloat can kill in less than an hour, so time is of the essence. Notify your vet to alert them you're on your way with a suspected bloat case. Better to be safe than sorry!
The technical name for bloat is "Gastric Dilatation-Volvulus" ("GDV"). Bloating of the stomach is often related to swallowed air (although food and fluid can also be present). It usually happens when there's an abnormal accumulation of air, fluid, and/or foam in the stomach ("gastric dilatation"). Stress can be a significant contributing factor also. Bloat can occur with or without "volvulus" (twisting). As the stomach swells, it may rotate 90° to 360°, twisting between its fixed attachments at the esophagus (food tube) and at the duodenum (the upper intestine). The twisting stomach traps air, food, and water in the stomach. The bloated stomach obstructs veins in the abdomen, leading to low blood pressure, shock, and damage to internal organs. The combined effect can quickly kill a dog.
Symptoms
Typical symptoms often include some (but not necessarily all) of the following Unfortunately, from the onset of the first symptoms you have very little time (sometimes minutes, sometimes hours) to get immediate medical attention for your dog. Know your dog and know when it's not acting right.
Attempts to vomit (usually unsuccessful); may occur every 5-20 minutes
This seems to be one of the most common symptoms & has been referred to as the "hallmark symptom"
Doesn't act like usual self
Perhaps the earliest warning sign & may be the only sign that almost always occurs
Significant anxiety and restlessness
One of the earliest warning signs and seems fairly typical
"Hunched up" or "roached up" appearance
This seems to occur fairly frequently
Bloated abdomen that may feel tight (like a drum)
Despite the term "bloat," many times this symptom never occurs or is not apparent
Pale or off-color gums
Dark red in early stages, white or blue in later stages
Lack of normal gurgling and digestive sounds in the tummy
Many dog owners report this after putting their ear to their dog's tummy
Coughing
Unproductive gagging
Heavy salivating or drooling
Foamy mucous around the lips, or vomiting foamy mucous
Unproductive attempts to defecate
Whining
Pacing
Licking the air
Seeking a hiding place
Looking at their side or other evidence of abdominal pain or discomfort
May refuse to lie down or even sit down
May stand spread-legged
May attempt to eat small stones and twigs
Drinking excessively
Heavy or rapid panting
Shallow breathing
Cold mouth membranes
Apparent weakness; unable to stand or has a spread-legged stance
Especially in advanced stage
Accelerated heartbeat
Heart rate increases as bloating progresses
Weak pulse
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