Assuming you are talking about keeping a puppy with its father after the puppy is born:
Yes, you can keep a puppy with its dad. In fact, it is often recommended to do so. Keeping a puppy with its dad can help the puppy feel more comfortable and secure, as well as helping to socialize the puppy. Additionally, keeping a puppy with its dad can help to bond the two of them and make raising the pup easier for both of you.