all about heartworms

Heartworms are roundworms that spread to your animals via mosquitoes. They are found in all 50 states and can live anywhere between 5 and 7 years inside your pet. The best way to protect your dogs and cats against heartworms is to provide them with year-round prevention. Symptoms are not usually evident until it is too late and heartworms work fast. They do not go away without treatment and though they can be tested for in dogs, they can not be tested for in cats so prevention is much more important.
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Heartworm Prevention:

• Heartgard - a chewable, monthly treatment for dogs 0-100lbs that prevents heartworms, roundworms, and hookworms
• Interceptor - a chewable, monthly treatment for dogs and cats that prevents heartworms, roundworms, and hookworms
• Interceptor Plus - a chewable, monthly treatment for dogs 6 weeks and older that protects against heartworms, roundworms, whipworms, hookworms, and tape worms
• Proheart - injectable heartworm prevention for dogs 6 months and older, that comes in a 6-month dosage and a 12-month dosage
• Adnvantage Multi - topical prevention for cats that protects against fleas, hookworms, roundworms, and ear mites

More information on heartworms can be found here.