Hello & welcome, I am Dr. B,a licensed veterinarian and I would like to help you with your wee one today.
How long has he been showing signs? All 3 days?
Is it a vomit or cough that he does when he brings up the foam?
Can he keep foo/water down?
Are his gums nice and pink (not white/pale)? Moist or sticky?
Any changes to his breathing or wheezing/congestion?
If you press on his belly, does he have any tensing, tenderness, discomfort, or pain?
Could he have eaten anything he should not have (ie bones,string, toys, plants, chemicals, human meds, etc)?