They do seem to have quite sensitive tummies (a trawl around the site will show lots of runny poo messages!!). It's generally recommended that if you change their food, you do it over a period of time rather than changing completely from meal to meal. If you find a brand they'll eat, stay with it rather than trying different things. Wanting variety in food is more a human thing than a feline thing

If he's thriving and it's only a very occasional spot, then it's probably nothing to worry about but you might want to get him checked out by a vet anyway. What sort of canned food have you got him on?

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Here he is! Sorry the middle one is sideways! This is on the window sill of my daughter's bedroom. He loves to look outside, although he won't climb on the cat tree yet!

He looks lovely.

I wouldn't bother with a cat tree if I had a view like that from my bedroom

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He's lucky to have it, (as are we! - It's employer provided!) and the cat tree in the lounge has the same view. I'm hoping it will entertain him during the day, (at least a bit!) when everyone goes back to school. He doesn't have a playmate, and we're waiting to see how he goes. He's very happy at the moment, but next week will be the crunch!