Can cats use both flea collar and flea spots?

I have 2 cats, one is about 8 years old, and the other is about 5 months old. The kitten has a cat & kitten flea and tick collar, and the 8 year old has a cat flea and tick collar. The collars haven’t done much against the fleas, so we bought "OneSpot Treatment for cats and kittens" thats supposed to kill fleas. I want to know if it is safe to use both the collar and the OneSpot treatment? The OneSpot treatment looks like its liquid that you poor on its neck.

How old does a kitten before he needs a flea collar?

I have used Frontier or Advantage collars for fleas and it really worked. I believe my kitten may be too young for a collar now and I have some kitten flea powder will that work for now?
Where do I get these kitty flea drops at the vet or can I buy them @ Walmarts?

My kitten has fleas and I was wondering what brands some of you would recommend for a four month old kitten. I live in Indiana if that helps any decisions. I was also wondering what I should get to keep them away since recently he’s wanting to go outside but I’m not letting him until he has a collar, leash, and flea and tick repellant. Thank you in advance.
I was thinking that when I let my kitten outside that I’d have him on a leash and I’d stay with him. That way I can keep an eye on him. I figured that this would be the best thing to do instead of force him to stay inside and then on his first chance just dart outside.

I just rescued a kitten from the flea market. He is very tiny and have small black bugs all over him. They are bigger than fleas. They are black and have a little red on them. Any ideas on what they are and how I can get rid of them? Flea shampoo did not kill them.

I have two cats. One 7 years old and the other is 10 weeks old. I leave dry food out for both of them all day and I keep the kitten’s food in my room and the adult cat‘s food out in the hallway.
The kitten sleeps in my room at night and it seems that whenever I bring him out to play in the day time, he likes to run to the adult cat’s food. (Vice Versa with the elder cat.)

How do I keep them from eating each others food?

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