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Hi, i`m Richard, a Veterinarian from the UK. Hopefully I can help today.
Is she managing to eat at all?
Is she able to drink?
If she is only on day 3 I would not be overly concerned at this stage. Mouth wounds heal very quickly in the absence of infection and you should hopefully be noticing some improvement over the next 48 hours. Tongues are notorious for not holding sutures and using longer lasting suture materials that are more resistant to breakdown in the mouth tends to lead to discomfort as these suture materials are physically stiffer which is uncomfortable in the mouth.
Will she lap anything from a syringe? What medication is she currently taking?
IV fluids would be a good idea if she is not taking anything at all. This would also facilitate potentially stronger pain relief which could help her appetite.
However, if you can get her to take fluids, if she will lap from a syringe, with some liquid food, you should be able to nurse her around at home.