That big a rat wouldn't set off a mine? I don't believe.

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There are about 80,000,000 mines under the ground in more than 60 countries. It is difficult and dangerous to clear these mines. About 50 people including many children were killed or hurt each day. In 2003, APOPO, a Dutch research company that trains the animals, came up with the idea of using rats to search for the mines.
     The animal trainers found that a kind of rats from Africa were clever and had a sharp sense of smell. The rats were about 75 cm long and weighted about 1.35 kg, light enough to run across a minefield without setting off the mines.

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Thanks, but 75cm, that's longer than most of the cats. Would that be 7.5 cm?