Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you with your wee one today.
Do you think he licked or ingested any of the spray? What was in it specifically?
What does his diarrhea look like? Any blood or mucus?
Are his gums nice and pink (notwhite/pale)? Moist or sticky?
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, stones, socks, toys, plants, chemicals, human meds,etc)?