India, Nov. 26 -- Dogs don't always tell you when something's wrong. They keep running around, playing, doing the same routines. But a shift in behaviour, a sudden scratch, or a patch of irritated skin is often the first hint that something isn't right. And when those signs show up, it's worth checking for two of the most common culprits - ticks and fleas.

Dr. Julie Buzby says fleas and ticks behave differently, but early warnings often overlap. With fleas, pet owners may notice quick, repeated scratching around the tail base or neck. Some dogs bite at their legs or develop small red spots that weren't there earlier in the week.

Flea saliva can trigger strong reactions. Dogs with flea allergies may itch intensely even with a light infes...