Yes, you can give Panacur for 5 days. The dosage and treatment duration are based on the weight of your pet, so it’s important to consult with your veterinarian before giving any medication. Generally speaking, dogs weighing between 2-25lbs should receive 11.4mg/pound of bodyweight once a day for at least five consecutive days; dogs 26-50lbs should receive 57mg (5 packets) once a day for five consecutive days; and dogs over 50lbs should be given 113mg (10 packets) once a day for five consecutive days. It is also recommended that puppies under 6 weeks old not be given Panacur as their immature immune system may make them more susceptible to side effects such as vomiting or diarrhea.