My Horse Is Foaming At The Mouth And Coughing A Lot. He Seems Depressed Also, What's Wrong?

My horse has had ulcers and one of the things he does when he gets them is suck on his tongue as a coping mechanism, the tongue sucking produces foam sometimes. Ulcers are very painful and I have found that Gastro guard has worked wonders to heal them

My horse too! He REALLY depressed sometimes, and he stands in the back corner of the stall, but its NORMAL for a horse to foam at the mouth WHEN IT HAS A BIT IN IT MOUTH, but if hes foaming by him self, SEE A VET, CALL ANIMAL CONTROL!!

Have your horses teeth checked for infection.