Chihuahua Jack Russell Cross

He is a third of the size of an average guinea pig, and weighs in at just a few ounces – but this tiny puppy could be a big deal when it comes to world records.

The miniscule chihuahua-Jack Russell cross – appropriately named Tom Thumb by its owners – is a serious contender for the title of being the smallest dog on the planet.

Little Tom was born just three weeks ago as part of a surprise litter to mum Spice, a chihuahua. Little Tom

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