Dogs don't always go into heat when we expect or there'd be a lot fewer pups in shelters. If the other dog goes much longer without a heat cycle a visit to the vet may be in order to make sure nothing is wrong and to spay the dog if it isn't to be bred. Spaying is also a good preventative for many types of cancers and infections. As far as I know any healthy, mature, female mammal can produce milk even without giving birth-including people. Physical stimulation over a long period of time can cause milk production. Some cats just feel a need to suckle on something (usually a blanket, towel, or plush toy) especially if they were weaned at a very young age. Your cat probably just started using the dog's nipple for comfort and that caused the dog to start producing milk. If the cat is injuring the dog you could try a belly band or a t-shirt on the dog. Is there a chance the dog is pregnant? That could also cause her to have milk.
She should get spayed, for one. I'm sure though that you knew that. I'd have her taken to a vet. Is this her very first heart? How old is she? Even if she were left outside for a few minutes (no matter if you have a fenced in yard) while she was in heat, she could've gotten into tie with a male. If she is a young dog, have her spayed, for her sake and for the puppies sake, the pregnancy needs to be aborted.
As for the cat, try your best to make sure she stops that. I'm not sure how much it could do, but I doubt it is any good for them to be taking on those kind of nourishments when they are adults, unless you have a kitten instead of an adult cat. It may also not be good for their teeth.
My dad has a dog, whom was about a year old when they introduced a kitten into the mix. The kitten was 9 weeks old. Missing it's mother, it treated Diva as so.. Diva produced milk, and nursed the cat. We would get onto them as well, but you have to realize.. the dog is probably doing it now, not only because of motherly instinct, but because when that milk builds up it is definitely uncomfortable.
hey all: I know about the negatives but the positives are that the bonding between the dog and the cat/kitten will be strong and maybe a lifesaving in future! my cherokee must have been taken from her mom early as well cos she will nuzzle my neck and used to try sucking(It was her clawing(makin muffins) that caused the discomfort. she will still do it sometimes when needing reassurance, but just for a bit then she lays her lil head on my shoulder or under my neck and purrs with contentment. It's adefinite bonding time with me for her. that may also be what your cat and dog are doing
I don't find it disgusting at all. My brother's pit bull nursed my cat's kittens years ago. It was very sweet. :) That said....if you get the dog spayed that'll end the problem. I don't think a dogs birth order has any bearing on when they do into heat. It doesnt with humans so why would it with animals.
there might be an added benefit for allowing your cat to nurse.(personally I think it's cute!) Some bitches have very sensitive nipples and won't allow the pups to nurse. the cat is getting them ready for the onslaught of 5 or so pups! Heck if the bitch doesn't mind, let her...save on cat food anyway!