My Cat is Acting Weird After Flea Treatment

By Josie F. Turner, Journalist specialized in Animal Welfare. February 5, 2019
My Cat is Acting Weird After Flea Treatment

See files for Cats

Cats are sensitive to certain chemicals, medications and even foods. Like humans, how sensitive they may be depends on the individual cat. When it comes to flea treatment, we need to be careful. The chemical used needs to be strong enough to kill and prevent a flea infestation. If it is too strong, it can pose a serious threat to our cat's health via poisoning or toxic shock. This is why flea treatment is applied using a pipette on the nape of the neck. Prepackaged pipettes control the dosage and the placement prevents the cat from ingesting the toxic chemicals.

While deworming and flea treatment is relatively very safe, you may wonder why your cat is acting weird after flea treatment. AnimalWised looks into the possible reasons for this behavior. While some may be of grave concern to their health, it is also important to remember poisoning isn't the only reason.

You may also be interested in: How to Know if My Cat is Sick

Flea treatment for cats

Even in indoor environments, parasites are a concern for your cat. If your cat is an outdoor cat, then the risk is even greater. An infestation can occur via many methods. If your cat ingests something they shouldn't, then eggs or larvae of parasites can pass into the gastrointestinal system. Interaction with feces or any close contact with an affected individual can be vectors for infestation. Some of the types of parasite known to infest cats include:

  • Hookworm
  • Roundworm
  • Lungworm
  • Tapeworms
  • Whipworm
  • Heartworm
  • Giardia
  • Isopora
  • Ticks
  • Fleas

Many of these are gastrointestinal parasites which make their way into the digestive system and leach nutrients. The results of an infestation vary with some causing serious discomfort and others being almost asymptomatic. Fleas are an external parasite and pass on to the feline host by attaching themselves to their coat. This occurs either by an adult flea jumping on to the coat of the cat from another animal or person, or by the larvae developing in the environment and attaching themselves to the cat.

Fleas cause their own physical problems in the form of itching, which leads to scratching and discomfort. This scratching can result in hair loss, painful sores and even infections when the wounds come in contact with bacteria. However, fleas also can carry other diseases and even further parasites. In fact, fleas “play an important role as intermittent hosts in the development of at least three species of tapeworms”[1]. This occurs because flea larvae eat the proglottids of tapeworms and then carry with them during the pupal stage. These are then ingested by cats and the tapeworm can complete its cycle.

There are many other possible diseases which can be caused by flea infestation. A report from 2017 even claims that “the prevalence of flea-borne diseases has been greatly underestimated by health practitioners and agencies”[2]. The same report reveals some of these diseases which include:

  • Rickettesial disease (caused by the bacteria Rickettesia)
  • Bartonellosis
  • Plague
  • Tapeworms
  • Flea allergic dermatitis
  • Feline leukemia virus (FLV)
  • Calicivirus

Since these infestations can lead to potentially life threatening illnesses, prevention is incredibly important. This is where deworming and anti-flea treatment comes in. It works by applying the serum onto the nape of the cat's neck. Most applicators will come in a prepackaged pipette which gives your cat enough protection for a certain amount of time, usually around 3 to 6 months.

The hair is parted at the back of the cats neck and the contents are squeezed out. The area is then gently massaged into this part of the cat. The treatment then spreads across the cat's fur and prevents infestation. While cats are known for their lengthy grooming sessions, the cat should not be able to lick the treatment in any amount which is going to cause particular problems. If the pipette has been misapplied, then this nay not be the case.

My Cat is Acting Weird After Flea Treatment - Flea treatment for cats

How does anti-flea treatment poisoning occur in cats

The contents of the anti-flea treatment pipette are absorbed into the skin. Intoxication can occur when the components are too strong for the individual cat's system. Perhaps they have a weakened immune system or are an otherwise vulnerable cat. The problem often occurs when the product is too strong for its intended usage. This could be when a cheap product is used or when an adult flea treatment is used on a kitten. Different products are marketed in different regions, so it is important to ask your veterinarian for advice on which cat flea treatment you should use.

Cat flea treatment poisoning can also occur when it is used on another animal in the house and your cat licks the treatment. Some anti-flea treatments for dogs come in aerosol form, so you need to ensure you don't intoxicate the cat when using it in the same environment. A cat could even lick the used pipette if we are no careful after application.

It is important to emphasize that the deworming treatment should be discussed with the vet first. They will assess the cat by giving them an examination and recording their vital statistics. If there are any factors which would make a certain type of anti-flea treatment unsuitable for an individual cat, the vet will be able to determine this.

Symptoms of flea treatment poisoning in cats

If your cat is acting weird after flea treatment application, you will need to consider the possibility of flea treatment poisoning. It is possible the cat will have ingested a small amount and will react disgustedly. However, if they have ingested enough it can pose a serious risk to their health. For this reason, it is important to look out for possible symptoms of flea treatment poisoning in cats:

  • Hypersensitivity to light
  • Hypersensitivity to noise
  • Weakness in hind legs
  • Constant ear tremors
  • Nerve contractions
  • Mandible crepitus (grating jaw)
  • Lack of muscle coordination
  • Seizures in severe cases
  • Hypersalivation
  • Dilated pupils
  • Tics
  • Temperature increase
  • Loss of appetite
  • Apathy and discouragement
  • Nervous spasms

Treatment of flea treatment poisoning in cats

The absorption of these anti-flea products can cause poisoning in the cat, even in relatively small amounts. These poisonings can be very mild or severe, the latter being potentially fatal if not treated in time. The most common products leading to flea-treatment poisoning in cats are fipronil and pyrethin. These are the group terms for different types of insecticides and pesticides. The exact amounts of pyrethin and fipronil in a product will depend on the brand.

When you discover poisoning, you will need to go to the vet. They will make an assessment and will determine if hospitalization is required. You will need to bring the product with you, especially if you have used an oral flea medication for cats. They will be able to provide the right antidote which will likely be applied via intravenous fluids.

The veterinarian will wash the cat to remove any remains of the treatment if applied externally. This will help to prevent seizures. Once this has occurred, the vet will apply the treatment necessary for treating subsequent symptoms. These symptoms may alleviate themselves on their own, but there is always a risk it will have affected the digestive system. This includes vital organs such as liver, kidney and brain. The vet may carry out tests to see if these organs have lost any functionality and treat accordingly.

My Cat is Acting Weird After Flea Treatment - Treatment of flea treatment poisoning in cats

Other reasons your cat acts weird after flea treatment

While poisoning is the most worrying reason your cat might act weird after flea treatment, it is not the only one. If your flea already has a flea infestation, then they might be acting irritable or annoyed because of the fleas. It might take a little time for the treatment to become effective.

Another reason your cat might be acting weird is that you have had to take them to the veterinarian. Even the most gentle vet might have to restrain a cat which is already nervous due to being taken out of their home. This anxiety might not stop after they get home. They will show signs of irritation which may include vocalizations and even slight aggression. However, these behaviors should stop eventually once they have calmed down.

This is why it is very important to know the symptoms of flea treatment poisoning in cats. You will need to determine the difference between being annoyed and toxic shock from poisoning.

This article is purely informative. AnimalWised does not have the authority to prescribe any veterinary treatment or create a diagnosis. We invite you to take your pet to the veterinarian if they are suffering from any condition or pain.

If you want to read similar articles to My Cat is Acting Weird After Flea Treatment, we recommend you visit our First aid category.

  • Permethrin poisoning in cats (Information for cat owners) - International Cat Care

Write a comment

Add an image
Click to attach a photo related to your comment
What did you think of this article?
My Cat is Acting Weird After Flea Treatment
1 of 3
My Cat is Acting Weird After Flea Treatment

Back to top