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Hello, you are through to Dr Linda, a UK based vet.
I'm sorry to hear this.
Has either cat seen the vet or had their stool analysed?
When were they last treated for parasites and which product was used?
Do they go outside?
Worms and other parasites like Giardia would need to be considered.
As it has been a couple of months since their wormer and they are outside, I would treat both with Panacur.
I would continue the sensitivity food and ensure they are not eating anything else.
We should also start a course of probiotic anti diarrhoea paste such as Protexin Prokolin.
If the diarrhoea persists, especially as they have weight loss, it is important they see a vet for a general check and some tests such as a blood test and stool analysis.
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Not at all and all the best!