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This can be a normal finding in dogs whereby the last voided faeces is more fluid and watery, so I wouldn't be worried. This is as long as Rosie is well happy bright alert and doesn't have diarrhoea, vomiting or any blood in the faeces. You could try bulking the faeces up a little with some bran (bran flake cereal is fine crumbled into the food, maybe 1/2 a tablespoon) Monitor her appetite if you feel it is definitely increased then she should be seen by your vet as sometimes conditions such as diabetes present like this, but I would expect her to be drinking excessively too!
Good luck and regards