First, antibiotics would not be recommended for a crushing injury alone.
The antibiotics would have been prescribed to prevent infection of the open dog bite wounds.
There are a lot of possible antibiotics that come to mind. They might include but are not limited to:
- Albon
- Amoxicillin
- Baytril
- Clavamox
- Orbax
There are a lot more. If you have a specific one that you want to ask about, feel free to let me know.
I really doubt that the cat lost a leg due to the antibiotic that was given. Sometimes, this is the only feasable option with a crushing injury.
Let me know if you still have questions.