My dog is sick after double Heartgard & Nexgard dose. Is he okay?

You did not mess up, its ok! They are both for fleas but work in different ways. Nexgard will kill the adult fleas (as well as ticks). However adult fleas are only a small part of the problem when it comes to fleas, because the eggs that may have been laid by the adult fleas will sprinkle off your dog, hatch in your carpet (eww I know) and the baby larvae will find their way back onto your dog (or other pets, or even you in very severe infestations). Sentinel renders the eggs laid by fleas unable to hatch. This article below may help explain this. Its possible that the medications may have contributed to her diarrhea today. If she is still eating, is playful and acting normally, see how she is in the morning, and let your vet know she had some diarrhea. Your vet may advise against giving them at the same time if he or she suspects that may have contributed. But the sort answer here it, you did not mess up. If the diarrhea is continuing to be severe, if she's vomiting, or acting dumpy at all, please see a vet tonight. https://www.petcoach.co/article/how-to-prevent-a-flea-and-tick-infestation/ Thanks for asking PetCoach! I hope that helps!

As long as he’s eating and feeling fine then go ahead and give the Heartgard. Wait another day to give the Nexguard just incase giving both at the same time could upset his stomach. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Charlie.

The good news is that Hartgard is a relatively safe drug, and it is difficult to overdose dogs with the medication. Typically, toxicity is worried about when the dog ingests 10-20 times the recommended dose. Your dog should be just fine :-)

Hello. Heartguard is generally considered very safe, even in a dog with a current heart worm infection. If there was a reaction due to the presence of heartworms, it is almost always some kind of pulmonary event. So, it is possible that he has just developed a sensitivity or had a one off reaction to the Heartguard. Do think about having Buster tested before giving another pill, & do try to remember to give it every 30 days. All heartworm medications do a great job, but only if doses are not skipped, especially for dogs living in warmer climates. And if he does not seem better tomorrow, please make an appointment with your vet to have things checked out. Thanks for using Petco Pet Education Center, formerly Petcoach.

NexGard has a large margin of safety if as dog gets or eats multiple doses. Monitor for GI upset and feed a bland diet for a few days to settle the stomach. Your dog will likely suffer no ill effects.

Hello and thanks you for your post on Petco Pet Education Center, formerly Petcoach this afternoon! Yes, this should be okay. Although both are oral heart worm and intestinal parasite preventatives and typically speaking, giving two heart worm preventatives together or within a short amount of time is not recommended, combining these two preventatives together accidentally one week apart should not result in a negative reaction. Sam may have some transient diarrhea or vomiting, however. I hope this helps put your mind at ease and best wishes to you and Sam!

Heartgard Plus has a very high margin of safety, so I would not expect this to cause any serious problems. I would recommend monitoring her for the next day or two to make sure that she's acting normal, but otherwise you shouldn't need to do anything different :) You can go ahead and give her next dose on April 15th as scheduled.