Is it safe to give my dog antihistamines for hayfever symptoms?

Yes, you can use either one of those antihistamines. For loratidine you can give 10mg (1 tablet) for Cetirizine you can give 20mg (2 tablets). If after one dose she is not better you should have Bonnie examined by your vet.

Yes, Claritin is among several over-the-counter antihistamine options that may be given for allergies. Frankly, they all offer only mediocre relief but can be helpful for very mild symptoms. I would still recommend touching base with your vet to make sure Claritin would be appropriate for Bruno with his medical history and any other medications he might be taking. If Bruno's allergies do not improve on an over-the-counter option like Claritin, there are much more effective options available by prescription from your vet. Hope this helps!

Benadryl (diphenhydramine), Zirtek (cetirizine) and Chlor Trimeton (chlorpheneramine) are all available in the UK. Discuss other options, both OTC and prescription, with your veterinarian. Read labels carefully and avoid any antihistamine with paracetamol.

In general, antihistamines are not very effective in dogs for itching - so unfortunately, it doesn't surprise me that you aren't seeing much effect with Piriton. You could certainly talk to Lily's veterinarian about trying a different antihistamine such as hydroxizine or diphenhydramine, as some dogs may respond a bit better to a different drug.

Loratidine (Claritin) can be given to dogs. Here is an information sheet that talks about dosing and side effects. ( https://www.petplace.com/article/drug-library/drug-library/library/loratadine-claritin-alavert-for-dogs-and-cats/ )

Handsome boy! He may have allergies from spring pollen or a mild cold. You can give Benadryl to reduce the nasal discharge and itching. There is a section on this website with information and dosages of common over the counter medications that are safe for dogs. if he stops eating, the discharge gets green or he's very lethargic then I would recommend a veterinary exam. Usually this will get better in a week or so without treatment. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Bo.

Hydroxyzine and Diphenhydramine are both human anti-histamines commonly utilized in the vet field for allergies. Histamines do not directly affect the liver, but will certainly have indirect effects.