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The usage of a dog's erect penis as a dildo, instead of letting the dog do his "natural" doggystyle thing with a human.
The penis is often bent backwards between the dog's legs and the "receiving end" ends up But to But with the dog..

Dildog is a cheap way of making porn movies, and does not involve any of the true passion associated with animalsex.
"Betty used the dog like a dildo, sticking it in her like a dildo and using her hand to move it."
by Mrdeath January 15, 2004
A hot dog with a dill pickle on it.
"Hey man, let's get a dildog."
by Eric C. Vento October 16, 2008