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Hello. My name is***** and I am a veterinarian that can answer your question. I understand Simba is being treated for an infection with Baytril. I am sorry to hear about the problem she has. Do you happen to know where the infection is coming from (i.e. blood, urine, etc.)?
How many days was he on the antibiotic? Was a recheck blood test performed before the antibiotic was finished?
7 days total with Baytril?
Yes, it sounds like he needs to stay on the antibiotic and not get off it until the infection is completely cleared. This antibiotic is also considered a "narrow spectrum" antibiotic, which means it will not treat other kinds of bacteria. The veterinarian may want to add an additional antibiotic to expand the coverage of bacteria. They should also consider performing a culture of the urine to see if the infection is located in that area.
The metronidazole treats anaerobic bacteria only, which is usually only those located in the intestines. It is unlikely the infection is there, so that antibiotic will not be much help. If antibiotics are going to be expanded then the most common thing to do is to add a penicillin or cephalosporin. An example is called Cephalexin or Clavamox. This would be a better choice. In the meantime, your goal is to keep Simba well hydrated and well fed in order to help recovery.
If you can not recheck the blood work to see if the infection is improving then that is a good approach. If he is not 100% yet then he likely still needs to be on the antibiotic. One of the ones I mentioned above would be the best choice.
Baytril is actually very similar to ciprofloxacin, so that medication will not broaden our spectrum as much as we need. It would be best if they would be willing to extend the antibiotic coverage with Cephalexin or Clavamox (or a sulfa antibiotic) while you are away so that he does not go off antibiotic.
Clavamox, Cephalexin, or a sulfa antibiotic is a better choice to add with the Baytril. They will expand the coverage of bacteria, which would be better in case there is bacteria that the Baytril does not treat.
That is all good. Continue to feed the regular food and offer water regularly. I am going to add one more possible antibiotic that would be good in case this is a tick borne illness. Doxycycline is a treatment for bacteria that ticks carry, but a blood test can determine if he has this infection. I would recommend to stick with the low fat options right now and focus more on him eating well. The chicken, rice, potatoes, or a low fat prescription food is good to stay on right now.
Please let me know if you have any other questions. You have done a great job nursing him back to health.
You are welcome. Take care