The recommended Benadryl dosage for dogs is 1mg per lb dog body weight. This means that if your furry friend weighs 20 pounds, the recommended dose is 20mg, and so on. This means that if your furry friend weighs 20 pounds, the recommended dose is 20mg, and so on. Claritin (loratadine) is an antihistamine drug which can be given to dogs. This page contains the recommended dosage, important safety information and more. Loratadine and all antihistamines, in general, are among the inexpensive ways to treat canine allergies but it is possible that this antihistamine may not be effective in all patients. While Loratadine is safe for dogs, there are dog owners who are still quite hesitant to administer the drug to their pets. Loratadine, perhaps best known by its brand name Claritin, is a popular over-the-counter antihistamine for people. It can also be given safely to dogs under veterinary supervision. If your dog has an allergic reaction, visit your veterinarian for advice and medication. The most popular antihistamine is Diphenhydramine. It can be given to a dog of any breed, but it should be used according to prescription and in proper dosage. The regular dosage of Claritin (loratadine) for dogs is 0.2 mg for each pound your dog weighs. Typically vets will recommend 5 mg every 24 hours for small to mid size dogs, and 10 mg a day for larger dogs such as Labradors. You should take your dog to see the vet first before using this medication for specific dosage information, as cases vary. As an example dosage, a 50 lb dog would need 10. If your dog cannot take Claritin or Loratadine, the active ingredient, your veterinarian may recommend Zyrtec ((generic name: cetirizine), another non-drowsy antihistamine to treat allergies. Claritin Dosage for Dogs Overview of Loratadine for Dogs and Cats. Loratadine, commonly known as Claritin® or Alavert®, is a type of antihistamine drug commonly used in dogs and cats to control itchy skin. The correct antihistamine dosage for dogs depends on the particular antihistamine. It also depends on the size of the dog. It also depends on the size of the dog. In the tables below are some typical recommended dosages for various antihistamines. The dosage of Claritin recommended to be given to the dog depends upon the size of the dog. As a rough rule of thumb, if you divide the weight of the dog (in pounds) by five, that will give you the ideal dosage (in milligrams) of Loratadine. So if a dog is 50 lbs, 10 mgs of Loratadine will be about right. (Remember that adult tablets are usually 10 mg and the children’s version is usually 5.