Cetirizine (Zyrtec® or Reactine®) is one of the most commonly used over-the-counter antihistamines recommended by veterinarians. Claritin® can be used but is not typically recommended by veterinarians as some forms of Claritin® contain decongestants such as pseudoephedrine which is very toxic to dogs.
Recommended Claritin Dosage For Dogs
The recommended dose for Claritin is 0.2 milligrams per pound of body weight every 12-24 hours. This is only a general recommendation, and as with all medication, you should consult with your veterinarian and have them give you the appropriate dose for your individual dog.
loratadine (Claratyne®) – also second gen. It is available as 10 mg tablets. The dose is 5–20 mg/dog once daily.
You may be wondering whether Claritin or Zyrtec is the best pet allergy medicine—but which antihistamine works best for you depends on the severity of your symptoms. For example, a person with a mild allergy to cats or dogs may do well with Claritin. Another person with more severe allergies may do better with Zyrtec.
In dogs, vomiting, lethargy, urine retention, and diarrhea have been reported. Signs of overdose include rapid heart rate, hyperactivity, or depression, depending on how much was ingested.
Cetirizine (Zyrtec® or Reactine®) is one of the most commonly used over-the-counter antihistamines recommended by veterinarians. Claritin® can be used but is not typically recommended by veterinarians as some forms of Claritin® contain decongestants such as pseudoephedrine which is very toxic to dogs.
Your vet will give you more specific instructions for your dog, but the general recommended dosage is 0.2 milligram of Claritin for each pound of your dog's weight. According to this general outline, if your dog weighs: Between 1 and 14 pounds: Give a maximum of 2.5 milligrams of Claritin twice daily.
Antihistamines with the active ingredients of diphenhydramine, chlorpheniramine, cetirizine, clemastine or loratadine are usually safe for most healthy adult dogs. Hydroxyzine is another dog-safe antihistamine and one of the most effective available, but it's only available on prescription.
Zyrtec is one of the safer medications you can give to your dog, so as long as you do so correctly and under your vet's guidance, your pet should be good to go. Zyrtec is also a difficult medication for a dog to overdose on. They have an extremely high tolerance for it, so long as they aren't allergic to it.
Best treatment: Antihistamines
Antihistamines are commonly used to treat dog allergies. Their histamine-blocking quality tackles airborne allergens and reduces symptoms in your pup. The safest over-the-counter options for your dog include Benadryl, Zyrtec, Claritin, and Allegra.
Fexofenadine, commonly known as Allegra® or Telfast®, is a second generation antihistamine drug that may be used for dogs and cats to control itching and other signs related to allergic conditions.
Benadryl is a great medication for use in dogs with mild-to-moderate allergies. Seasonal allergies, food allergies, environmental allergies, and allergic reactions to snake and insect bites all respond to Benadryl in most cases.
Other safe antihistamines for dogs include Claritin (loratadine) and Zyrtec (cetirizine). They produce less sedation than Benadryl does but could still make your dog drowsy. Warning: Make sure your OTC allergy medicine only contains antihistamines.
The human antihistamine Claritin (loratadine) is generally safe for dogs and can provide allergy relief. But you should always consult with your veterinarian before giving your dog any human medications.
Plumb's Veterinary Drug Handbook recommends giving a standard dosage of 25 milligrams for a 25-pound dog two to three times per day. As a general rule of thumb, use 1 milligram per pound of your dog's body weight. For example, a 50-pound dog would be given two 25 milligram tablets.
Here's the recommended Zyrtec dosage for dogs based on their weight: Less than 10 pounds: 2.5 milligrams (half of a 5-milligram pill or a quarter of a 10-milligram pill) 10–50 pounds: One 10-milligram tablet. 50+ pounds: Up to two 10-milligram tablets.
Cetirizine (Zyrtec®, Reactine®) is an antihistamine used to treat and prevent pruritus (itching) associated with atopic dermatitis, urticaria (hives), and insect bite reactions in cats and dogs. Its use is in cats and dogs is 'off-label'. Many drugs are commonly prescribed for off-label use in veterinary medicine.
Benadryl dosage for dogs.
According to the Merck Veterinary Manual, the safe dosage is 2-4 milligrams of medication per kilogram of weight, or 0.9 to 1.8 milligrams per pound. This amount can be administered two to three times daily, depending on your dog's symptoms.
Vets generally prescribe Claritin for dogs in a dosage 0.2 milligrams per pound of body weight. This can translate as giving a small dog around 5 milligrams of Claritin every day, or 10 milligrams for a larger dog.
ANTI-histamines, such as diphenhydramine (Benadryl®), cetirizine (Zyrtec®), and hydroxyzine, are commonly taken by humans to treat allergy symptoms and can be used for dogs as well. These medications work by preventing histamine from binding to cells and exerting its effects.
Yes, loratadine is generally safe for dogs, but dosage and frequency should be determined by a veterinarian. Although it's less likely to cause drowsiness than other antihistamines, side effects such as vomiting, diarrhea, and dry mouth may occur.
The dosing schedule is also much more convenient, with dogs weighing over 10 lbs getting a single 10mg tablet once daily. Dogs weighing less than 10 lbs can have half of a 10mg tablet once daily. Chlortrimeton is another excellent antihistamine for dogs, and is the drug of choice for kitty allergies as well.