NexGard SPECTRA have been shown to be safe and effective in various breeds of dogs when used as directed and, can be given to puppies from 8 weeks of age, providing they weigh at least 2 kg.

If he is exactly 15 kg you can use the medium size.

If it is round 15 kg., this product should be good enough. But it is more than half a kilo heavier then you should consider using the NG Spectra for large dogs.

NG Spectra treats, ticks, fleas, heartworms and most common intestinal parasites: roundworms, whipworms and hookworms. The most cases Nexgard spectra should provide enough coverage for your pet.

Yes, this product is preventative, you need to make sure your dog doesn't have heartworm.