At what age do cats/dogs go into heat and how long do they stay in heat?

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 6-9 months of age and typically have two heat cycles per year.  Each litter has, on average, between 6 and 10 puppies.  A dog’s heat cycle lasts a total of 30 days.

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