Natural Animal Health

[lyndytes]

My Mini Bull Terrier is being sick when he goes out for a walk (he's food
and white froth come up) but when he's in the house or back court yard he
is no problem but when i get he's lead out he's ears go back and he starts
to slavver then we might only get 50 meters up the road and he's sick. We
been to the vets and he gave him antacid liquid for a week, in that week he
did not go for a walk then on he's first walk he's sick.

Any Help Please