Dougal is, in a word, greedy. Greedy for power, greedy for respect, greedy for sugar. He is very self-involved, and tends to not like doing things if he can't benifit from it himself. The new CGI movie toned down Dougal's selfishness alot, they softened him up. It made him greatly un-Dougal-like, but there you go.
Both Dougals do share a few things though. One being a love for his owner, Florence, and another being his love for sugar. He dotes on Florence, and is probably the only creature other than himself he loved dearly enough to risk his life for. As for sugar, well, Dougal loves it. It is his love for sugar which causes the disasterous collision with the Roundabout, which releases Zeebdad, thus starting the adventures of the second movie. As Brian says, Dougal always has to make a big entrance.
Dougal, it seems, only really sees Florence a a true friend out of the group, even if in the stock-motion version, Brian thought that Dougal was his best buddy. Dougal, however, couldn't stand the snail (or at least, that's what he said) and avoided him at all costs. Dougal's love interest in the stock-motion show was Ermintrude, though the dog didn't reciprocate the cow's feelings, poor Ermy.
Dougal is not the sharpest tool in the box, either, in fact, he's downright SLOW. He spends so much of his time thinking about either himself or sugar that sometimes things seem to just fly over his head. He's also an enormous coward. The movie tried to give him a heroes ending, but Dougal is STILL a coward.
According to the stock-motion show, Dougal has a Scottish heritage. His uncle, a Scottish Terrier, lives in the Highlands. Yeah...odd.
On Dylan, Dougal made himself an enemy. He disliked Dylan more than Brian, seeing the rabbit as nothing more than a lazy good-for-nothing lump. Zebedee did point out, however, that dogs and rabbits were simply not meant to get along....even if Dougal is not in the least bit interested in eating Dylan..maybe if Dylan were covered in chocolate and sprinkled with sugar, THEN he may reconsider.
"What, Tuseday? I like Tusedays. On Tusedays, we bake cake" (On Zebedde saying he wished this day would never come)
"You've got lawnmowers on the brain, ALL OF YOU!!"
"Haven't got any jumping suagr, have you?"
"We must go and investigate. Come, Watson"
"Typical! Nothing for the poor, over-worked, under-paid postman, typical! Typical! Oh well, through snow, through hail, thorugh rain, here we go...lucky the sun's shining"
"I can't go around like THIS. People will talk!!" (On having Dylan's guitar glued to his back)
"I wouldn't want to meet anything in the Garden after dark"
"I'll not rest until I've done everything in my power to bake things right....make thing right"
"Sugar? Who needs sugar? Not me! I quit!.....this morning"
"A throne! A perfect place to enjoy my last gobstopper"
"Why do I have to be the guard dog? What's wrong with a guard snail? Or a guard cow?"
"Where are my manners? Ladies first" (On enetering a booby-trapped ridden cave)
"Well, diamonds ARE a girls best friend. Off you trot, Ermintrude"
"My forte has always been 'sit Dougal', that and 'stay, Dougal, stay"
"During scary thunderstorms she (Florence) insists I get into bed with her...for her protection"
"The fearless warrior couldn't make it today, so we came instead. We'll drop it in to him on the way home"