This five-month-old puppy, weighing just 11 ounces and standing at only four inches tall, is thought to be the UK’s smallest dog.

Adorable Tyson, who can be seen in the above video, is a Lhasa-Chi – a cross between a Lhasa Apso and a Chihuahua.

He was hand-reared by Rosemarie McLinden after he was rejected by his four siblings.

"He was tiny when he was born and he was eventually pushed out by his brothers and sisters because he was so tiny,” said the 46-year-old from Keal Cotes, Lincolnshire.

"He just hasn't really grown since.

"I had to start feeding him myself as he couldn't latch on to his mother. He was so small he just could not breastfeed due to the tiny size of his mouth.

"I bought a little dropper and had to feed him day and night every two hours until he was a little bigger.

"We had to take him away from the rest of the litter because he is so small they think of him as a squeaky toy.

"I've been doing a lot of research and I can't see a smaller dog anywhere in the entire country."

His pugilistic namesake, Mike, boasts a neck size of 20.5 inches, but little Tyson is too small for a dog collar and has to be carried in a hamster carrier.

He fits in the palm of his owner’s hand and weighs less than a bag of sugar.

Whilst Tyson’s stats have yet to be verified by the record-keepers, his nearest UK challenger is Pagan, a five-inch Yorkshire terrier from Hull, Yorks.

Video credit: SWNS