This is spiraling out again. The root of this is innocence. We aren't talking about consent or whatever else is being poured into this conversation to convolute the subject, we're talking about innocence.
A lot of people regard dogs as pets, but many couples will decide to own their first puppy together to prepare themselves to have a baby. Many people will even call some of their pets their baby, so the comparison between pets and kids is very valid and alive. Likewise, just as a kid doesn't know what he/she is doing, a pet doesn't know what it's doing. There's an innocence there and once again, there are people that abuse that innocence for their own self-pleasure.
On behalf of vegans, and animal activists alike, pets do have feelings and as with anything innocent, even though you may not outwardly see the effects of any harm done to the pet, you'll never know because you are not the animal being subjected to this. I for one absolutely believe this is animal abuse, not just because of the erosion of self respect to the person involved but because there's trust, innocence and feelings in that animal that that person has completely taken advantage of.
I feel sorry for any pet subjected to this form of deceit.