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thanks anna, the grooming is a good idea, and just rung the vet and he said get a plant spray and spray him with water, as this evaporating off their bodies cools them in much the same way as sweating works.
our flat doesn't have many cool spots its a right old sun trap, so yesterday i trailed go-cat all down the stairs to our front door hoping it might tempt him to go down there and realise its cool down there, but the silly thing lay all day on a black leather chair - he doesn't help himself at all bless him!
it just worries me cos we work all day and although I pop home at lunch time to see him and play with him he has 4 hours morning and 4 hours afternoon on his own and he seems to enjoy lying in the patches on sunlight on the landing, which is going to do him no good at all!!