Why is my dog vomiting, lethargic, and not eating after flea meds?

I'm sorry to hear that Boo hasn't been feeling well! It is possible that the permethrin spray or collars may be related to his vomiting, but other possible causes include a foreign body intestinal obstruction, virus, parasites (particularly tapeworms since they can be transmitted by ingesting infected fleas), among others. At this point, I recommend leaving his flea collar off and bathing Boo in original blue Dawn dish soap to remove any residue remaining from the permethrin sponge bath. Withhold food for the next 12 hours, then gradually offer very small frequent meals of a bland diet of boiled white meat chicken and white rice for a few days. After a few days, gradually mix the bland diet with his normal food over another 5-7 days. If Boo continues to vomit, develops diarrhea, becomes lethargic or stops eating, he will need to go to his vet for further evaluation. Once he vomiting resolves, be sure that Boo is regularly receiving a high quality flea preventative, such as Nexgard, Bravecto, or K9 Advantix II. I hope that he feels better soon!

Poor Gus, Bugzy, and Charlie! You can see some vomiting as a side effect of a deworming treatment. Give them a bland diet of boiled white meat chicken (no bones) and white rice to see if that helps them. Feed it for a couple of days, and then slowly add back in their normal diet. If the vomiting continues on the bland diet, they stop eating, and/or become very lethargic, I would take them into a vet immediately. Best of luck.

It could be the Tablet (is it Bravecto by any chance?) i have seen it happening before. withhold food for 12 hours then offer him boiled boneless chicken and rice every 6 hours in small portions. if he is eating and not vomiting, continue with this diet for 2 days. After 2 days, you can put him back gradually on his normal food. If he continues vomiting or is not eating, take him to the vet to get treatment.

Hello and thank you for reaching out to Petco Pet Education Center, formerly Petcoach. With this much vomiting I would be worried about the possibility of Penelope eating something she shouldn't have, such as a toy or other foreign material, which could have caused a blockage or obstruction of her intestines. The topical flea and tick medication should not cause her to vomit. I recommend offering Penelope a small amount of boiled chicken and rice, and see if she tolerates this. If she vomits this up and/or cannot even keep water down, she should be seen by your veterinarian for x-rays. If she can eat a small amount of this bland diet, I recommend feeding this boiled chicken and rice for the next 2-3 days and slowly transitioning her back to her usual diet. I hope this is helpful!

I am sorry to hear that Peanut is feeling so cruddy To be honest, that kind of reaction from flea / tick medication starting 24-36 hours after application would not be very typical. Usually signs of illness would start pretty shortly after. The only reason it could be delayed is it Peanut waited awhile and then managed to lick the stuff off his fur. Depending on the type of drug that was used, some have antidotes while others are just treated supportively. There are no antibiotics that are used to help with this kind of issue, unless the vet believes that one might assist with inflammation or prevent a secondary infection. Based on the clinical signs you have described, the best medication that the vet could prescribe would be something to nausea, diarrhea, and acid production. In terms of diagnostics I would run if you came into my office with these symptoms, I would definitely recommend starting with some baseline blood work and potentially some x-rays to rule out a possible foreign body in the intestines. Hope this is helpful.

Thank you for submitting your question regarding Kirby. I recommend that he sees his veterinarian. While any medication can cause side effects, three weeks is a long time for him not to be feeling well. His veterinarian will examine him and determine if laboratory work is necessary. From there, treatment can be started to help him feel better. I hope this information helps!

Thanks for using Petco Pet Education Center, formerly Petcoach! If there is no further vomiting then she should be ok as this may be an isolated episode. However, if this continues, she should be evaluated by a veterinarian for further assessment and treatment. In the meantime, you may feed her a bland diet composed of boiled chicken breast and white rice which help with an upset stomach. Good luck and have a great day!