Your puppy certainly looks like a chihuahua cross (or maybe a miniature pinscher cross).
And yes, it's possible for different size breeds to have a successful mating. And age? Female dogs do not stop seasons as they age, the way humans do, so an unspayed bitch can become a mother at an old age. Shame the owners don't keep an eye on when she is in heat and don't keep her safe, or get her spayed. Which, even at 11 years of agae, maybe a safer option, than another pregnancy.
Hope you have taken your puppy to your vet for a check up, vaccinations and flea and worming treatment. One of the puppies is pot bellied - this is a symptom of having worms. So all puppies are likely to have them.
And yes, it's possible for different size breeds to have a successful mating. And age? Female dogs do not stop seasons as they age, the way humans do, so an unspayed bitch can become a mother at an old age. Shame the owners don't keep an eye on when she is in heat and don't keep her safe, or get her spayed. Which, even at 11 years of agae, maybe a safer option, than another pregnancy.
Hope you have taken your puppy to your vet for a check up, vaccinations and flea and worming treatment. One of the puppies is pot bellied - this is a symptom of having worms. So all puppies are likely to have them.