mastiff or great dane?

Question

which one comes into heat more often;
mastiff or great dane? how long does the heat last? at which age is the last heat?

Answer 1

dogs are dogs
they season twice a year once in spring and once in fall
the heat lasts 21 says

Answer 2

This section is Men's Health. You're more likely to get informed answers if you post this in the "Dogs" section. That's where people who know about dogs hang out.