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Oh my goodness! emmuhub should be the one to provide his answer because this is his riddle. I was giving my guess also.

Anyway, let's try to analyze it again.

The riddle says that in a vehicle there were 7 people carrying 7 boxes each. So 7 people X 7 boxes = 49 boxes

There were 7 mother dogs in each boxes.

So 49 boxes X 7 mother dogs = 343 mother dogs

Each mother dogs was carrying 7 puppies.

So 343 mother dogs X 7 puppies = 2,401 puppies

Therefore,

343 mother dogs + 2,401 puppies = 2,744 dogs & puppies

Dogs & puppies have 4 legs each.

So 2,744 dogs & puppies X 4 legs = 10,976 animal legs

7 people have 2 legs each = 14 legs

Therefore,

10,976 animal legs + 14 people legs = 10,990 legs

Thus, final answer should be 10,990 legs in a vehicle.

emmuhub, can you confirm if this is correct? Or are there any more answers to this riddle?