If there was a house cat as big as a tiger, would she be just as dangerous as a tiger? The answer must be No. This is because there would be at least a couple of major differences.
Firstly ‘house cats’ are socialised to humans and dogs (and ideally other companion animals). This means they are friendly towards humans and other companion animals. In other words they are domesticated cats. That’s the whole point of socialisation and without it there would be no domestic cats.
Tigers are almost always wild and totally unsocialised. They are not friendly towards humans and see humans as prey or another potential prey ‘item’ or indeed a hostile animal to be feared.
Therefore a domestic cat the size of a tiger would be a very friendly but an incredibly impractical pet. Play sessions would have to be conducted with the greatest of care because in play domestic cats swipe and bite for fun (play hunting). It would be painful to say the least if your cat bit you in play if she was as large as a tiger.
Tigers are incredibly strong due to great muscle mass. Domestic cats have less muscle mass. If you enlarged a domestic cat to the size of a tiger she would not be as strong as tiger. The bite force, foreleg and hind leg strength would not be the same.
This is because the domestic cat comes form the N. African wildcat which is slighter in frame than the tiger (ignoring for a moment the size difference). Also I would argue that 10,000 years of domestic cat evolution has made the animal weaker as they are fed and protected by humans.
It could also be argued that domestic cats are less intelligent than wild cats and therefore less intelligent than tigers. This is because of 10,000 years of not having to fend for themselves. Wild living breeds intelligence. Also cat breeds are inbreed at least potentially. This can create a lack of intelligence sometimes.
A domestic cat such as a Ragdoll cat as large as a tiger would be an enormous, soppy, longhaired fluff ball. She’d flop down on you and pin you down. She’d try and sleep on your lap which would be damned uncomfortable. She’d eat you out of house and home. She’d poop in a gigantic litter tray and pee gallons of pee. Your house would probably smell of cat. You’d have a ton of hair on furniture and the hair strands would be very long. Think Saint Bernard dog times four or five.
You’d have to have a gigantic cat scratching post! Those claws would be awesome and some irresponsible owners would declaw her. Shame! But she would not be as dangerous as a tiger. No way.