This is probably a very controversial topic. I personally like to use the term "mate" because Balto and Jenna "getting married" just doesn't sound right. XD And as for Balto and Jenna being mates: Well, they did have pups, didn't they?

(Really, they didn't need to have pups to be a "family", but I'll get to that later.)
Many people prefer the term "mates" for their characters because, well, we are human, and therefore like to attach our own meanings to the animal world (keeping in mind that these are CARTOON dogs we're talking about); i.e. A dog love story just wouldn't work if the two alphas hated each other. My fanfic
The Way We Were (that I'm currently writing) discusses "matehood" as two dogs falling in love and making the decision to start a family together; a family technically can be a husband and wife (or whatever doggy terms you prefer) without any children. Do you see what I'm saying?
So, although you are technically correct, we
are talking about cartoon animals here, and for another thing, in dog fanfiction (at least on BS) the dogs have the intelligence and perception of humans; shouldn't they have the same conception of and capacity for love?
Hope I gave you something to think about.
-Iditarod