How do you know when a cat has worms?

i have 2 cats one 8 months and the girl 3 months. they sher litter box the older cat seems to be normal and the little one has diarrhea but i guess thats cuz she changed food from kitty milk to wet food (cuz of his small teeth and the little amount of teeth that she has) but how do i tel if they have worms? yes yes yes go to the vet i know but my question is is there a way to know when a cat has worms??
Answers:
when you see a white things stuck by there asss under or by the tail it will look like a piece of rice.. worms crawl out of there butts and fall off ..the cat loses weight and licks its self alot

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usually diarrhea is a really good sign that they do, but if you just switched foods you may want to wait and make sure its not the food upsetting its stomach, but the only positive way to know is go to the vet and have them tested but they should be dewormed at like 3 or 4 months old (most dogs and cats are born with worms)

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YES... THEY SEEM TO ALWAYS BE BUSY DOWN THERE AND ONE SURE WAY...WHEN THERE SLEEPING ..QUICKLY LIFT THERE TAIL UP AND YOU-LL SEE THE WORMS PEEKING OUT..MAKE SURE THE ROOM IS SEMI DARK AND USE A FLASHLIGHT TO VIEW

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tape worms look like tiny seeds but if they have fles then they have tape worms they need a check up and the doc can give the vac that they need ...

good luck

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Depending on what type of worms are present, you may see things like white rice grains (tapeworm segments) in their poo, around their bottom or even in their fur.

Signs of heavy or prolonged worm burden are diarrhoea, excessive hunger and, the classic look of a cat with worms, skinny with a pot belly.

If you know you should go to a vet - do it! Get some worm meds from them, prevention is better than cure.

Chalice

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they eat and eat and eat, or feel there tummy if it is hard, they could have worms, check there poop, you'll see little worms moving around in it. most cats are born with worms.

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you can usually see little white things like grains of rice when they lift their tails up. these are tape worms.

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Sometimes thay drag there rear ends across the floor or there bellys are really round and exstended. All cats have worms if they are born to a mother who is not dewormed. and who is not strickly a inside cat. The worm medication from the vets is cheap. I would worm them anyway because you can get the worms.