Vet clinics inundated with cases of cats and dogs suffering health problems and rashes in 'Dirty 30' Siberian city.
The pet lost all four paws in January in -40C cold in Tomsk, but video shows him walking again with artificial titanium limbs.
Vets failed to save bullterrier who kept his master warm on cold nights as pair avoided attack by bears and wolves.
Remarkable tale of survival for animal as it dragged limp body 11km back towards home leaving trail of blood behind him.