They can be hormonal and moody, fuss with food etc. It lasts 3 weeks. There are complications which can arise 5-6weeks post season. Watch for mammary development or severe mood swings and guarding which can be a sign of false pregnancy 5-6weeks post. Also infection of the uterus, signs of vomit, drinking excessively and thick vulva discharge ,sometimes bloody, are all signs ( more common in older dogs but can happen young) Again 5-6 weeks post.
There's not a lot to help with other dogs locally. Some get hormone injections to stop the season but there are health risks with this and if you don't have a male entire dog yourself it probably isn't worth it.
Spaying is recommended 12 weeks post season and once the dog is back to normal in behaviour and health.
Oh the joys of entire female dogs
