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Best Answer: Female cats typically have their first heat around the age of six months, which usually lasts for 5 to 7 days. Cat's heat cycles are light dependent and they usually have heat cycles every 9 to 13 days from January through October, though some indoor cats exposed to constant light times will cycle all year.I advise unless you want kittens to keep her in at these times.Source(s): http://www.bestfriendspetcare.com/Pet_FA...at's heat cycles are light dependent and they usually have heat cycles every 9 to 13 days from January through October, though some indoor cats exposed to constant light times will cycle all year. I advise unless you want kittens to keep her in at these times. Source(s): http://www.bestfriendspetcare.com/Pet_FA...
Cats can have their first heat cycle between 4-6 months of age and will go in to heat approximately 3 times a year. Each litter typically has between 4 and 6 kittens. Dogs go into heat at about 4-6 months of age and typically have two heat cycles per year. Each litter has, on average, between 4 and 10 puppies. A dogâs heat cycle lasts a total of 30 days. The vagina will swell during the first 10 days. There will be bloody discharge during the next 10 days.