It's less likely to find a donkey who will tolerate it than for the dog to love up on the donkey. First of all, that donkey is just a baby, don't expect that same donkey to be as tolerant as an adult, even if they're raised with dogs like that. Except maybe to that particular dog if the dog doesn't start annoying the donkey. They do form strong bonds to other animals but that doesn't mean they'll tolerate offenses. I have had dogs form bonds with the horses and vice versa but both horses and donkeys can hurt a dog very quickly and donkeys are less likely to tolerate it, and are more aggressive when they do find something offensive. Horses will mostly just run away when something they don't like happens and then if it doesn't kick in the dog's prey drive the horse's natural curiosity cause it to return (low prey drive is more acceptable behavior for a horse) a donkey won't spook like that, it will turn and face the danger, to paw or kick and likely will injure,maybe even kill, a dog, unless that dog is lucky or very stock savvy. Donkeys have no natural predators and are often used as livestock protection against coyotes so they learn pretty quick that 'dogs' aren't fun. My current donkey is more tolerant of the dogs than the last guy (who would chase them down even if they were separated by fencing) but she'll still get after them occasionally, if they get too close.