This is the incredible moment a mother dog took her seriously ill puppy to the vet for life-saving treatment.

Heart-warming CCTV footage shows the homeless dog carrying her dying puppy in her mouth through the rain and leaving it at the door of a veterinary clinic in the Adnan Kahveci neighbourhood of Beylikduzu, in Istanbul Province, Turkey.

A veterinary technician noticed the situation and quickly brought the puppy inside for treatment on January 13.

The puppy was in poor condition, with a dangerously low heart rate, and was taken to intensive care immediately.

The mother dog stayed close by, watching over her puppy throughout the treatment.

Veterinarian Baturalp Oghan revealed that the mother dog had previously given birth nearby, but most of her puppies had died.

Animal lovers had brought one surviving puppy to the clinic earlier, unaware there was another.

The mother dog later found the last remaining puppy and brought it to the clinic for help.

Dr Oghan explained that the mother dog's milk was insufficient, so the clinic was supporting her puppies with additional food.

The mother dog and her puppies are now being cared for at the clinic, where their health is steadily improving.

Dr Oghan said that the clinic staff were touched by the mother's determination to save her puppy and that they hope to find a loving home for the family once they fully recover.

He added: 'Everything is going well so far. The treatment for both the puppy and its sibling will continue for a little longer. During this time, we are not accepting visitors due to their health.'