How can i make my dog relax on walks?

i work as a dog walker, only little dogs, and a few of them are nervous like you describe your pug ... my system when i have a dog like that is to walk the dog beside me on a short leash, no waving from side to side or back and forth, a short lead and a collar not a harness (i know that is hard with pugs, i am pretty sure they require a harness which is unfortunate because it gives you minimal control and makes it difficult for a quick correction) and i just keep walking for the first half of the walk completely ignoring anything that makes them anxious and most importantly, ignoring their anxious response ... i pretend like it is not even happening and keep moving ... you have to remind yourself the dog is not in any danger and to keep him moving is what you want ... do not stop and sit and click and relax, keep moving ... stopping it probably stressing the dog out more and in my opinion the behaviour would escalate ... i do not drag, but i also do not acknowledge anything that triggers them like bikes, skateboards, strollers ... i usually will see those triggers before the dog and that way i can steady myself to keep walking like nothing is happening (when i first started dog walking i would get anxious and tense seeing a trigger and that only made everything worse, i had to train myself to stay calm otherwise how can the dog be calm) ... i do not think you should make the dog sit and click and praise ... i personally think that is confusing for the dog ... like you are trying to get the dog to walk past things that stress him out and instead of ignoring which is what you want you are marking the anxious behavior and rewarding it by clicking or providing a treat ... i found it took about a month for most of the anxious ones to mellow ... so i would do the first half of the walk just walking, no sniffing, no nothing ... it should be about the dog focused on you and walking and nothing else ... and when you turn around to come home, the dog will have used up some energy and will want to do some sniffing about, which will change his focus from stressful things in the environment ... i have done this with many small dogs over the years and it has worked every single time ... any anxiety not based in reality, you ignore, you do not let him know there is nothing to be afraid of ... you SHOW him by taking charge that there is nothing to be afraid of and moving past his stressors like you are walking by your tv ... but you say nothing to him verbally when he is behaving anxious ... if you have a friend with a calm dog, walking with a calm dog helps too ... good luck :O)