In general, if both parents of a dog have bent tails, the chances of the puppies having bent tails are higher. However, even if only one parent has a bent tail, there is still a possibility that the puppies could inherit the trait. It is also possible for a dog with a straight tail to produce puppies with bent tails, if the dog carries a recessive gene for the trait.
In addition to genetics, environmental factors can also influence tail development. For example, if a puppy's tail is injured or damaged during development, it may result in a bent tail. Proper nutrition and care during pregnancy and development can also help to ensure healthy tail development.
If you are concerned about the potential for your dog's puppies to have bent tails, it is important to discuss this with a veterinarian or a breeder who is knowledgeable about the breed and the genetics of tail traits. They can provide more information and guidance based on the specific situation and help you to make informed decisions about breeding and puppy care.