Heat refers to when a female cat or dog is receptive to mating and can become pregnant.
Dogs
On average, dogs have their first heat cycle at 6 months of age, but this can vary by breed. Smaller breeds may come into heat earlier while large breeds may not have their first heat until 18 months of age. Dogs will typically be in heat for 2-3 weeks at a time and will go into heat every 6 months, but this can also vary by breed. Small breeds may cycle more often and large breeds less often.
Cats
On average, cats have their first heat cycle at 6 months of age, but can go into heat and become pregnant as young as 4 months. Cats will go into heat multiple times during the “breeding season” which is generally January to late fall in the US, however indoor cats and those in warm climates can cycle year round. A cat will go into heat for up to a week at a time. If she has not mated she will go out of heat for 1-2 weeks and go into heat again.
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