Quote Originally Posted by dragondawg
The vet would have been more accurate in saying: The infection that is spreading will commonly spread, and be fatal if treated with the wrong antibiotics.

Amoxicillin a drug in the class of Penicillins is almost worthless for humans, and for most animals due to antibiotic resistance. The bacterial produce a β-lactamase that inactivates the penicillin drugs. In answer to this problem Clavamox was created, which consists of Amoxicillin plus clavulanic acid which inactivates the β-lactamase before it can inactivate the Amoxicillin. Increasing the dose of Amoxicillin alone, given likely bacterial resistance, is next to worthless.

The Metronidazole was a good try in combating anaerobic bacteria in the wound. The air bubbles or gas being produced are signs of an anaerobic infection. However the fact it continues to expand indicates antibiotic resistance to Metronidazole, and/or possible aerobic bacteria interfering. A bite wound results in a mixed bacteria infection.

At this stage with the infection for all purposes systemic, the dog needs IV and/or IM injections of such drugs as Baytril or one of the newer quinolones, a second-generation cephalosporin (eg, cefoxitin, not cephelexin), and possibly clindamycin. It could cause intestinal problems such as bacterial overgrowth, but that is minor compared to the current life threatening infection. In another words you need the heavy duty drugs and multiple ones.

If the infection continues unabated, then sooner or later it will hit the major organs. Presumably if you measured your dog's current temperature, with the toxins being produced it wouldn't be too surprising to find a 103+ degree temperature. If the major organs get hit, and start to shut down the dog's temperature will dive to 95, and death will occur shortly there after. The dog should be hospitalized at a Vet Hospital.
Are you a vet?
I really only understood half the stuff you said in this post..
I am sure that the two different vets I went to know what they are doing/talking about... I hope they do anyways, because if what your saying is tru, then why wouldnt they keep her hospitalized instead of sending us home with little-no hope.