Make sure you have plenty of territory space...
New Limits on how long pets stay pregnant
To make sure that pets are not locked by pregnancies, a maximum time of 6 days have been placed on pregnancies before it expires. What this means is that it is most important to manage your territory space more efficiently, as you will only have 6 days after your pet is ready to give birth to make space.
This change was made to not lock fathers to pregnant mothers whose owners do not free up enough space. Hopefully this change will make it easier to request and breed, knowing your pet will not be locked should a user decide to not make enough territory space.