Dear PF members I really need some help from someone who likes crunching numbers and making calculations. Today I collected two 10 year old cats for surrender to charity. They have always lived indoors with an elderly owner but he went into care 4 months ago and the cats have been alone since then but being fed by relatives. They are both hugely obese, the girl is bigger than any cat I’ve ever seen. Their diet consisted of Go cat and tinned tuna. They will be weighed tomorrow and I can post the weights, but I then need help to calculate a food intake that will allow them to safely lose weight slowly. I advise ditching the dry if at all possible and we can provide Bozita cans right now, possibly other zooplus foods going forwards.