Health Question

How do you know if your beagle has a cold? She is still recovering from her colitis, she started her diarriah back up again last night. I am not sure how to tell if she has a fever. But you know that inverse sneeze that beagles do sometimes? She keeps doing it, and is sometimes sneezing afterwards. Also sometimes when she walks around or when you lift her, she sounds like her nose is full of snot, she like, gargles or what not....