You can't tell usually just by looking or behavior or even because their body changes. Many go through false pregnancy so it is not an accurate way to tell. My favorite way to tell is the ultrasound. It is easy, non-invasive, and you can tell the earliest this way. And you can get a picture of them before their even born! 20 to 30 days in (no other time) your vet can feel for particular lumps that let them know she's probably pregnant, after that they can't feel them and what they are feeling for kind of blends in to everything else. Mid-way a repro test can be run (ask your vet). And 45 days and after an x-ray can be run and they can have a good idea of how many pups by how many skeletons show up on the x-ray.
Gestation period is usually 59 to 63 days but they can go a little sooner or a little later. Start taking her temperature around day 57 - 59 if the vet (or you) doesn't think you should sooner. Normal temp is 101 to 102 but usually closer to 102. When she drops to 98 (or 99) it'll usually be within the next 24 hours.
Since you have a Pug (they are usually a c-section breed due to build of mom and pups) it is important that you're vet is experienced and knowledgeable with surgery on a Brachiocephalic breed, (smashed face, major airway problems and additional care must be taken when inserting the tube, and sensitivity to anesthesia) since it can be VERY different from a surgery on a dog like a lab. They also need to make sure that the techs are taught not pull the tube too early on these breeds and not when it is acceptable to do so on a breed built differently. They have a very hard time breathing if that happens and can even die, a Brach dog should be darn near chewing that tube when it is pulled pretty much. Not to mention the whole c-section surgery deal. If you are going to attempt a natural birth you should do this at your vet so they can watch and get her on the table and surgery done as soon as it becomes apparent she's going to need one. If you try a natural birth at home then you will need to know ahead of time what signs mean to get her to the vet immediately. It is also good to have the sort of relationship with your vet that means they are willing to get out of bed and do the surgery for you if it becomes necessary and is possible. Emergency vets tend to be experienced with emergency c-section since those little guys seem to love to come in the middle of the night. It's a little easier and not really an emergency when you already have a plan because you have a c-section breed. Much easier on the scheduling and to make sure your vet is available :-). You still have to worry about the surgery and mom and pups but I guess it's better than worrying about something going wrong during birth and THEN a surgery.
Good luck and let us know if she's pregnant please. Here's a pic of an ultrasound a little more than 30 days in.
Gestation period is usually 59 to 63 days but they can go a little sooner or a little later. Start taking her temperature around day 57 - 59 if the vet (or you) doesn't think you should sooner. Normal temp is 101 to 102 but usually closer to 102. When she drops to 98 (or 99) it'll usually be within the next 24 hours.
Since you have a Pug (they are usually a c-section breed due to build of mom and pups) it is important that you're vet is experienced and knowledgeable with surgery on a Brachiocephalic breed, (smashed face, major airway problems and additional care must be taken when inserting the tube, and sensitivity to anesthesia) since it can be VERY different from a surgery on a dog like a lab. They also need to make sure that the techs are taught not pull the tube too early on these breeds and not when it is acceptable to do so on a breed built differently. They have a very hard time breathing if that happens and can even die, a Brach dog should be darn near chewing that tube when it is pulled pretty much. Not to mention the whole c-section surgery deal. If you are going to attempt a natural birth you should do this at your vet so they can watch and get her on the table and surgery done as soon as it becomes apparent she's going to need one. If you try a natural birth at home then you will need to know ahead of time what signs mean to get her to the vet immediately. It is also good to have the sort of relationship with your vet that means they are willing to get out of bed and do the surgery for you if it becomes necessary and is possible. Emergency vets tend to be experienced with emergency c-section since those little guys seem to love to come in the middle of the night. It's a little easier and not really an emergency when you already have a plan because you have a c-section breed. Much easier on the scheduling and to make sure your vet is available :-). You still have to worry about the surgery and mom and pups but I guess it's better than worrying about something going wrong during birth and THEN a surgery.
Good luck and let us know if she's pregnant please. Here's a pic of an ultrasound a little more than 30 days in.