You cannot congratulate most horses, but you can congratulate the Divine horse Topaz 5 times per day in order to win gifts. ;)
Howrse has a page for people's birthdays. Click on one of them and then you click congratulate.
You find a horse that the b-day is listed. Then you click on the person username and congratulate them on their page.
You can congratulate anyone even if there are not your friend. You just go to their page and click congratulate.
If you are under a certain level, You will not be able to see it, but it is under the Genetics tab on your howrse. Sometimes they exceed their genetic potenetial!! On Howrse I'm KarenjustLOVEShorses please congratulate me.
you have to congratulate someone on there birthday :)
Go to: My Account < Personal Info and change it from there. I am poptropicatart on Howrse. Congratulate me and join my EC, Darke Stables.
go to their profile then congratulate them. I think you can send a message too by clicking on your congratulation.
There's a lot you can do in fifteen minutes on Howrse! You could take your horse for a ride, do some training or competing with him. Read and participate in the public forums, create a forum of your own if you have an EC, sign player's guestbooks and congratulate them, and lots more.
You click on the icon with a bottle on it to nurse your horse on howrse
You can't congratulate them specifically for their birthday, but on their page there is a box with a link you can click to congratulate them. If you want to make it clear that you congratulated them because it was their birthday, PM them and say something like, "Congrats of your birthday!"
Howrse gestation takes 12 horse months.