Namely this one:
Besides, it's more litter.
It's more food.
It's more mess.
It's more claw clipping and nail capping.
It's more money for pet sitters.
It's more vet bills and visits.
But isn't it also more love?
So I've been doing some homework and the general consensus seems to be that getting the same gender, around the same age is a good way to introduce a new cat into the house. For my blog friends with multiple cat households, did you follow that advice? What did you do and how did it work?
13 hours ago