Glad to hear he's picking up... chicken is always the winner in my house however I also boil rice in stock cubes & mix that in with chopped chicken or boiled fish
.... Bear if feeling poorly insists on cheese, preferably soft goats cheese which I have to dunk me finger in then let him lick it off, on demand of course!
But a good stand by we use at the rescue is a good quality of kitten food, either wet or dry, which ever takes their fancy... I prefer Hills or Royal Canin.... never failed yet!!!
And believe me some of the size zero cats that have been through our doors...
Also if you do find the A/b's aren't enough and they discover something amiss (fingers crossed not!) check out the types of food you can give to help them... follow this link to a website we use, and create an account (so long as you follow this link each time you will donate 1% of your total bill to our rescue centre too!!
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http://www.vetuk.co.uk/idevaffiliate/idevaffiliate.php?id=275
Check out the different types of food from Hills, Royal Canin etc..... hope it helps!!