Which Antihistamine Is Safe For Dogs?

Which Antihistamine Is Safe For Dogs? Both cetirizine (Zyrtec) and loratadine (Claritin) are considered safe for dogs in the right dosage. However, they are also frequently combined with other ingredients like decongestants, which can hurt your dog. Always consult with a vet before giving your dog any new medication. Which antihistamine is best for dogs?