When it comes to your dog’s parasite prevention plan, a combination attack is best. You should use a heartworm preventative in combination with one of these vet recommended repellents. Vectra 3DSide effects:There is a potential for chemical burns at the site of application. Additionally, the ointment may cause restlessness and anxiety. This may be a direct result of the treatment or it may indicate irritation at the site to which it was applied. The treatment may also cause lethargy, panting, racing heart, loose stool, vomiting, fever, and excessive thirst. Active ingredients:• Permethrin – a synthetic form of an insecticidal compound produced by the chrysanthemum flower and degrades quickly in contact…