@fluffyduff : You usually can pull out while climaxing respectively shortly before. It takes a little time for your ejaculation to actually leave the penis.
That's definitely not enough safety for copulation with human girls, as precum and a small amount still might or will get inside, but it's not relevant in terms of a dog girl. She won't get pregnant, anyway. DNA not compatible, no chance.
Stimulate her beforehand and do whatever you want - if you're climaxing raw, just pull out and have a kitchen paper towel laying aside.
Maybe your girl is crazy for it and licks you clean, who knows. Mine is. The few % which flow in will not leave a waste or "cum dripping" out. And if your girl likes the taste, she'll clean herself anyway if there's something in the fur near her vulva.
The risks are very low and the fun is more intense. Additionally many dog girls will synchronize with the male, as such if she feels that you're climaxing, they might climax as well shortly beforehand. But this depends on the individual dog's personal traits and goals.
If you like to follow some of the other hints (while I don't see a need to "stimulate her by pure skin" and exclude sleeves, as they can add so much fun for her, actually - which is just not possible with smooth penis skin, no matter the lasting time) - do that as well. I personally would not "distract" my thoughts from my girl and the others as I love to focus, but it all depends on what people wish for. Try some hints and experiment a bit.
And - after all - if you ejaculate in her completely, this is not comparable to exaggerating furry drawings where cum splats everywhere.
It takes two to four hours and you'll not see anything dripping or running out. The fur might get sticky for a while, but you can easily clean it with a damp cotton cloth. Or she licks it clean, many do.
It is suggested to go with her on a walk beforehand, as well as after you're done (with a small break in between, 10-20 minutes are fine, can be 30 as well) and let her drink (which she will in most cases), peeing washes most of the remains out. Which additionally reduces infectious risks in terms of UTIs
If sleeves are not in your favor, then try the other hints in regards of distraction or playing with your imagination. There are lots of ways and I'm sure you'll find one working for both of you.