Pregnancy in animals is a lot different and complicated as compared to humans. Along with that, they are unable to convey a proper sign if there is some issue or they feel any kind of pain. So, a wise decision is to take them regularly to a veterinary doctor and get all the tests done.
If everything is not done on time it can go worse and you can lose your dog along with all the puppies inside. There is a certain diet for pregnant dogs. Besides this, you can look for who can write an ESA letter online in case you need one.