My Chanel the silky terrier she is 10 pounds 5 onz, pre prego weight, she was 13.9 on day 60 when we went for the x rays. I asked the vet and he said you have to take into consideration, the water, placentas, milk all those little things contribute to gain weight, is not just the puppies..
some girls gain more some less.. but is all taken into account..
hugs