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My name is ***** ***** I have been a Vet tech for 30+ years. I am so sorry to read about this issue with your Cat. What I would like you to do is wash the Tail area with a Diluted Betadine solution and warm water. Dilute the Betadine to a Dark tea color. clean the area well. You can then apply some Plain Neosporin to the the area. This sounds like a Spider Bite, Possibly a Brown Recluse. That can attest to the fact the flesh is eating up and the area is so bad. A Snake would cause more issues than what you are seeing. I suggest the cat be seen as soon as Possible, because the Venom from the spider will spread and will not stay localized. The may have to derbride the tail, or possibly dock it depending on how the area has progressed. If They can determine if it was a Brown recluse bite they may have some Antivenin.
The walking Drunk was a Vestibular Issue, and if Idiopathic and not ear infection related should resolve on its own. As far as the cehalexin we do not know how much was ingested. It is given to cats, so this will have to be something to monitor. There may be vomiting or Diarrhea, depending how much she licked. If she sarts getting ill from it, please have her seen at the ER for that was well as the tail issue. The sooner she is seen for all of this the better. Please hit reply for questions or concerns.
Hi I am checking in on your Cat to see if you had her in to be seen by the Vet. Have they started treatment?