Published dose range
The published veterinary reference range for loratadine in dogs is 0.2-0.5 mg per kg of body weight, given every 24h. In practice: 5 mg small dog / 10 mg large dog daily.
Source: Veterinary Partner (VIN) →Plain loratadine ONLY. Claritin-D (pseudoephedrine) is toxic.
Skip it or ask a vet first if
Claritin-D / any -D decongestant version
If you think you overdosed
Call the Pet Poison Helpline: 855-764-7661 or ASPCA Poison Control: 888-426-4435. Both are staffed 24/7 by veterinary toxicologists.