that "blah"-kind-of-feeling

My 4-year old dalmatian hasn't been feeling too well since yesterday and I am bringing him to the vet in a while (I'm just waiting for my dad). It's a good thing he hasn't lost his appetite yet but I can't help but worry because he seems lethargic and is not as active as the other dogs.

I've already lost a puppy last year due to an acute viral infection that hit his digestive system and I couldn't risk losing another dog (if i can help it). I'm really worried and I guess it was not such a good idea searching the net for possible answers because I came across something as simple as dog fever to life-threatening cancer just by comparing Coy's symptoms.

I'm just hoping it's nothing serious. Our dogs are our family and having one of them sick is something we don't take lightly, just as we would if any human family member is ill.