Reactions to Flea Medication

Some dogs can experience bad reactions to flea medication.

Although flea medication products are safe for use in most situations, bad reactions to these products can and do occur. Pets that receive topical flea treatments can have reactions, such as allergies and skin sensitivities, to the chemical pesticides these treatments contain. The side effects of these medication products can range from mild to severe on a case-by-case basis.

Function

Flea medication products are commercially available in a number of different forms, including ingestible flea preventatives, topical flea preventatives and bath products containing flea preventatives. These products contain insecticides that are specifically aimed at killing and repelling fleas and other biting insects such as mosquitoes and ticks. Although these products are intended for use on dogs, cats and other companion animals, there are situations where the animal can react badly to the ingredients in the product.

Time Frame

The amount of time that elapses between the administration of flea preventative and a reaction to the medication can vary significantly. Skin sensitivities to the flea medication are more likely to occur right away, while the topical flea medication is still on the skin and in the fur. Within a period of 24 hours, most flea products are absorbed into the body, and secondary sensitivities may occur at this time.

Identification

Skin reactions to flea medication can present in different ways, including hair loss, hot spots, sores and rash. An internal reaction to the flea medication can present with shaking, seizures, vomiting, diarrhea, refusal to eat and weakness. These reactions occur when the pet is sensitive to the chemical ingredients of the product, or when they are poisoned by ingesting improperly applied flea medication. If your cat or dog displays any physical or behavioral changes following the application of flea medication, they may be reacting badly to it.

Treatment

Bathe the pet immediately with a mild dish detergent with a degreasing agent like Dawn. This will remove any product that has yet to penetrate into the pet's system. Book an appointment with your veterinarian immediately, because sensitivity to flea medication or flea medication poisoning is a serious matter. Observe the pet closely until you can bring him into a vet, watching for life-threatening symptoms like seizing or neurological changes. If he appears to be in distress, see a veterinarian immediately.

Expert Insight

"Using the right flea medication, and using it properly, is of vital importance in preventing reactions to the chemicals that they contain," said Caroline Tanaka, a veterinarian in Austin, Texas. "Stick to veterinarian-recommended flea preventative products like Advantage and Frontline, and apply them according to the manufacturer directions."

References

• Caroline Tanaka, DVM; Veterinarian; Austin, Texas
• "Dog Owner's Home Veterinary Handbook;" Debra M. Eldredge, DVM; 2007