Dog and Cat probably are friends, but they'll never admit it in public. Living in the same house, they have similar interests, such as bodgering in the garage or gardening when the weather is fine.
They could watch it for hours, offering critical advice and being in the way. They really do enjoy any mistakes or clangers which may happen.
Their best mates are a gang of unruly hedgehogs who live in the garden shed, however there is a bunch of blackbirds living in the shrubbery who are rather scary...