how to care my 1.5 month lab

Question
i have a 1.5 month old lab puppy when i was bought it was looking healthy but last 1 week he is lose his fatness and he is not looking good plz advice me how to care my dog????????

Answer
I know it's common in India to buy puppies so young.  Here in the USA it is actually illegal to sell them before 8 weeks.  In any case, pups will get lanky and then get heavier before they grow taller again.  But it could also be a medical condition, so you should have your vet do a full check up and also make sure the puppy has no parasites or worms.  Also, make sure you are feeding a good quality commercial puppy diet.