I am glad Hannah is feeling better. I found this on the net about bloat.

Recommendations to help avoid Canine Bloat:

Veterinarians continue to study the bloat problem and still have many unanswered questions. Researchers prepared the following recommendations to help prevent canine bloat. You should discuss these recommendations with your veterinarian and other Great Dane owners:


1. Feed the dogs two or three times daily, rather than once a day, and at times when someone can observe them after they have eaten.
2. Avoid vigorous exercise, excitement and stress one hour before and two hours after feeding. Walking is okay because it helps stimulate normal gastrointestinal function.
3. Feed dogs individually and in a quiet location.
4. Make diet changes gradually over a 3-5 day period.
5. Ensure water is always available but limit the amount immediately after feeding.
6. Watch for any actions or behavior that may signal abdominal discomfort (abdominal fullness, pacing, salivating, whining, getting up and lying down, stretching, looking at abdomen, anxiety and unsuccessful attempts to vomit, etc.


Bloat phases, symptoms and recommended actions:

A. Canine Bloat (GASTRIC DILATION-VOLVULUS) is an acute disease or digestive problem believed to be caused by excessive swallowing of air while eating, gastrointestinal secretions, and gas for food fermenting in the stomach.


BLOAT IS A LIFE-THREATENING EMERGENCY.


B. Some symptoms may be anxiety, evidence of abdominal fullness after meals, heavy salivating, whining, pacing, getting up and lying down, stretching, looking at abdomen, unproductive attempts to vomit, labored breathing, disinterest in food, and stilted gait. Severe symptoms, such as dark red, blue, grey or white gums, a rapid heartbeat and a weak pulse are normally followed by prostration and death.


BLOAT PHASES, SYMPTOMS AND RECOMMENDED ACTIONS


PHASE1

SYMPTOMS:

1. Pacing, restlessness, panting and salivating.
2. Unproductive attempts to vomit (every 10-20 minutes).
3. Abdomen exhibits fullness and beginning to enlarge.

ACTIONS:
Call Veterinarian to advise of bloat case enroute. Transport dog to
Veterinarian immediately.



PHASE 2

SYMPTOMS:

1. Very restless, whining, panting continuously, heavy salivating.
2. Unproductive attempts to vomit (every 2-3 minutes).
3. Dark red gums.
4. High heart rate (80 to 100 BPM).
5. Abdomen is enlarged and tight, emits hollow sound when thumped.

ACTIONS:
Apply first aid if Veterinarian care is more than 10 minutes away.
Then, transport dog to Veterinarian immediately.

PHASE 3

SYMPTOMS:

1. Gums are white or blue
2. Dog unable to stand or has a spread-legged, shaky stance.
3. Abdomen is very enlarged.
4. Extremely high heart rate (100 BPM or greater)and weak pulse.
ACTIONS:
Death is imminent! Apply first aid immediately. Transport dog to
Veterinarian as soon as possible (even while applying first aid if
possible).