Nexgard spectra is one of the best flea and tick treatment for Dogs. It is a beef flavoured chewables which is loved by Dogs. It prevents flea and ticks in Dogs. It also prevents flea infestation in dog for 5 weeks and control tick infestation for 4 weeks. It also prevents heartworms disease on monthly treatment. https://www.canadapetcare.com/nexgard-spectra-for-dogs/heartwormers-treatment-364.aspx