Hello Josephine. Sorry to hear your little ferret is so poorly, suggest you persevere with the Synulox, how are you giving it to her. Have you got a syringe with the measure on it, if so that should be OK, but try giving it very slowly, as if the liquid goes into her mouth too quickly, she'll just spit it out all over herself. I've just spoken to my next door neighbour who keeps and breeds ferrets, and is very knowledgeable, about feeding your ferret while her throat is so sore. So here are his suggestions -
Cooked white fish, or salmon, or tinned sardine (the type that is tinned in oil). Any of these mashed up very small.
Or raw liver chopped up very fine. These are all high protein which she needs if she's very thin, to help build her up. Also these will slip down her throat easily while it is still sore. He also suggests getting some liquid glucose from the chemists. Mix a small amount (say 2 teaspoons) with the raw yolk of 1 egg (not the white part). He says the glucose will build up her energy level. Have you only the one ferret? He also asked what she has to sleep in, if it's hay this can sometimes be a bit musty, which can cause respiratory infection, and he suggests using dust-free wood shavings (that what his ferrets sleep in), obtainable from good pet stores. We do hope she soon recovers. It would be nice if you could let us know, how things are progressing. Good luck. Schutz.