Your dog should visit the vet for a checkup soon after having her puppies. Together, you and the doggy doc can find the right nutritional plan for your dog. However, if you continue to notice weight loss in your dog, you can expect your vet to ask you questions! Tell her: The type of food you’re feeding her (bring in the bag or a picture if you’re able). Whether you’re feeding your dog meals or are free-feeding your pup. If your pup’s bowel movements have been normal, runny, or constipated. Whether your dog’s water intake is normal and as expected. About any health conditions your dog may have. Be sure to bring your dog’s vet records with you and, if possible, use a vet who knows your pup’s history.