Yes you can give Clarkia to animals.

//www.curezone.org/diseases/parasites/clarkia.asp

Blueduck

You can also use parasite zappers on cats. http://www.zapperplans.com has them for $10. ebay also has some good deals. ..Also http://www.drclarkstore.com has a parasite cleanse kit with the 3 herbs you need to kill parasites(walnut hull, Wormwood , cloves) for $14. ..and here's a link with instructions for worming pets with those 3 herbs http://www.drhuldaclark.org/therapy_parasite7.asp

What kind of worms?

Diatomaceous Earth got rid of my cat's roundworms, but I don't think it works on tapeworms.

Black walnut can be dangerous in both dogs and cats unless you know what you're doing. Its one of the things that are only advised to use if its prescribed by a holistic vet. Cats are sensitive. So you might want to do some google searches first to learn more.

I don't know much about it because I've had no need for it. This subject just comes up on a lot of other natural/herbal dog and cat boards I'm on.

BLACK WALNUT is is good for humans>>>>But don't bother with trying to give that to your cat it doesn't taste good to cats and they won't eat it and it doesn't contain the other supporting herbs that soothe the stomach and support the body reaction to killing the parasites. use this one for pets: http://www.pets4homeopathy.com/remedies.html
(scroll down until you see PARASITES) there's another place that is selling it for only $6.50: http://www.ihealthtree.com/paralixer-2oz-king-bio-natural-medicines...
your cat may vomit the first day, but that will stop after the 2nd day. I gave it to all 13 of my cats and only one vomitted, he was the most parasitic one too-- a feral wild cat. but that is normal for some cats with parasites to vomit. but the other 12 cats didn't vomit at all.

DO THE PARALIXER FOR 30 DAYS: 4-6 DROPS OF WATER PER 2 CUPS OF WATER (PUT IN THEIR BOWL). DO 1X PER YEAR MINIMUM, 2X PER YEAR IF OUTDOOR CATS, 3X IF A CATTERY WITH MULTIPLE CATS.

but the pills at the vets give only kill about 3-5 species of worms, whereas the paralixer kills tape, roundworm, hookworm, and like 20-30 other types.

sometimes the vomitting means the doseage is too high for that cat, try using less. i gave my cat a half of a tape worm tab once even though his body weight called for 1.5 pills. but it killed the tape worms right away. so apparently the doseage can depend on the cat and not always their size.

ALSO SEE BELOW FOR THE PET ZAPPER COLLAR THAT ALSO KILLS parasites AND VIRUSES AND PATHOGENS.

it's homeopathic/all herbs clear, odorless, tastelss, and you just put 4-6 drops per 2 cups of water (can put right in their water bowl and they will drink it no problem). do for 30 days and do 1x per year, 2x for multiple cat homes, and 3x for catteries (10+ cats).

use cat litter box liners and keep the box clean.

PET VET ZAPPER COLLAR: http://host14.ipowerweb.com/~stenulso/althealth/zapapet.htm
PARALIXER(HOMEOPATHIC HERBS): http://www.ihealthtree.com/paralixer-2oz-king-bio-natural-medicines... (CLEAR, ODORLESS, TASTELESS--USE 3-6 DROPS PER 2 CUPS OF WATER PUT RIGHT INTO PET'S BOWL (30 DAYS) THEN 1X PER WEEK FOR MAINTENANCE. No tricking or disappointment or wasting of products due to the cat smelling cloves or refusing Wormwood ! I'm using it now and NONE of my cats notice it at all, not even the picky ones.
Here's the ingredients: (The are all homeopathic/herbs - some of these herbs are their Latin names, I looked up each one up and Like "Tanacetum Vulgare" which is the same as the common herb names “Tansy, bitter button, cow bitter, golden button, mugwort.”
Calcarea Carbonica, Chenopodium Anthelminticum, Cina, Croton Tiglium, Filix Mas, Gambogia, Granatum, Lycopodium Clavatum, Mercurius Corrosivus, Natrum Phosphoricum, Santonium, Senna, Spigelia Anthelmia, Stannum Metallicum, Tanacetum Vulgare,