RECOMMENDED DEWORMING SCHEDULE (revised 2016)
 

     Internal parasites are the most common cause of colic in the horse.  Colic is the most common cause of death in horses.  No horse is ever completely free from the threat of internal parasites. Our best defense against parasite damage requires the protection of our horses’ environment from contamination with parasite eggs. Frequent pasture pick- up (twice weekly) and pasture dragging during dry weather can be very effective to reduce environmental contamination. Due to increasing problems with resistance to deworming products, fecal examination is required to identify the necessary frequency of deworming and the products that are effective.  Fecal exams, counting eggs per gram, are used to determine if your horse is a low or high shedder.  The best time to submit a fecal is just before the horses are due to be dewormed. More samples and treatment are needed in the beginning; but, as the situation at each farm becomes clear, both monitoring and treatment can become less frequent.  That is the goal. It is imperative to obtain an accurate estimate of your horse’s weight with a tape every time medication is administered. 
      Foals should also be treated less frequently than in the past.  After they reach 12 months of age, they will be dewormed as adults, but should not receive Moxidectin until they are 18 months old.  Pregnant mares and miniature horses should not receive Moxidectin.  Heavily parasitized horses should be treated with a double dose of Panacur (Fenbendazole) paste for 5 consecutive days.

 

ADULT LOW SHEDDER (Low Eggs Per Gram)

                            April                                                                    November             
 
Submit Fecal      Yes                                                                        No

Deworm With      Moxidectin (Quest)                                            Ivermectin/Praziquantel

                                                                                                        (Zimectrin Gold)
 
ADULT HIGH SHEDDER (High Eggs Per Gram)

                         April                    July                                             November
 
Submit Fecal    Yes                      Yes                                              Yes

Deworm With   Moxidectin        Pyrantel Pamoate(Strongid)         Ivermectin/ Praziquantel

Carolyn R Simmelink DVM 

117 Cross Highway, Redding CT 06896 

    (203) 938-3906