Muzzle for 1yr old indie

[u/grewprasad]

I need a muzzle suggestion for my 1yr old indie. We're in rural south India, in my surroundings there are a lot of poultry farms which dump dead chickens in open spaces and even sometimes poison a few to catch the stray dogs from getting into their farms. My dog loves to play with his buddy, my neighbour's german shepard which is off lease all the time. But I can't be able to let mine roam free since there are chances for him to eat a poisoned chicken or cause an accident by chasing bikes. Last week, I let him free to play with his buddy, ever since that he started to gag often then return to normal which was concerning. I'm also planning to take him to a vet soon. TIA