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Lisa
Lisa, Certified Vet Tech
Category: Dog
Satisfied Customers: 16186
Experience:  AAS Vet Tech. Bully breed rehab & Behavior modification
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I JUST TOOK IN A FEMALE MASTIFF 3 DAYS AGO, FROM A LADY WHO

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I JUST TOOK IN A FEMALE MASTIFF 3 DAYS AGO, FROM A LADY WHO COULDN'T KEEP HER. SHE WAS ALREADY 'IN CYCLE', NOT SURE HOW LONG IT LASTS.
Hello! My name is XXXXX XXXXX it will be my pleasure to help you with your dog today.

The estrus (heat) cycle of a dog is around 21 days.

Of course, it depends on the dog and can vary between 18-25 days.

If you'd like to have her spayed, you could call around and see if there is a vet in your area who will spay a dog in heat. I know the majority of spay/neuter clinics will, but general vets may be hesitant to do it.

As for keeping her apart from the males...I'd keep them apart for at least the next 3 weeks...just to be safe.

I hope this helps.
Lisa and other Dog Specialists are ready to help you
Customer: replied 3 years ago.

can you tell me how long the gestation for a dog is?

A dog is pregnant for 63 days.
Customer: replied 3 years ago.

One last thing, how often does a dog 'cycle'?

Twice a year. Every 6 months or so.