A little puppy born so small that her owner feared she wouldn’t survive is believed to be Britain’s smallest dog.

Mini, a Yorkshire terrier Chihuahua-cross, weighed no more than an egg and just 1.3ounces at birth – overshadowed by her brothers and sisters who are at least three times her size.

Her owner, Emma Williams, was so worried the cute puppy wouldn’t live for more than a few days that she began a dedicated feeding regime in a desperate bid to raise her weight.

As well as Mini feeding from her mother, Emma gives her a milk formula every two hours through a tube to boost her chances of survival.

Now one week-old, the tiny dog has reached 1.9 ounces, allowing her to rejoin her siblings.

The average weight for a puppy of this type is 4.5 ounces and they can weigh up to 15 pounds when fully grown.

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