How old can a dog be wormed internally and externally

Puppies should be dewormed at around one month of age or older, but the exact timing should be determined by the dog’s body condition. In general, puppies should be dewormed once a month. It is important to note that the dewormer should be placed in a place where the dog cannot lick it or that the dog should be given an Elizabethan collar to prevent poisoning.