Dear XXXXXXXX,
No. If she was spayed, she can not have a phantom pregnancy. I am not sure why she is putting on more weight if she is exercising more. Is she eating some of the puppie's food? If she is, that is higher in calories and will cause her to gain weight.
But I have to say...Oh my gosh that is so sweet the way Mollie has bonded with the puppy and is taking care of her. It is probably helping her cope with the loss of her jack russel friend. Mollie now has a job and feels extra important. That is great!!!
Veterinarian
Veterinarian in practice for 10 years. Compassionate, Caring, Experienced.