I spend 24/7 with my chihuahua and know instantly when something is up. I could tell after he gulped down a treat a little too big that there were remnants stuck in his throat and had all the collapsed trachea symptoms. He had a little but now it was really bad. Anyway they told me olive oil is a good way to soften hard bits of food so I started putting a few teaspoons in his wet food and seriously his 'honking'/snoring is 70% better. Whatever was stuck is now not and it was there for 2 weeks. He never snored before either. Maybe your pom has some food stuck. There's a post on google about eucalpytus oil and showers too that apparently helps.