Dogs wont breed

You can use the "Be nice to" interaction under the "Friendly" menu to get the dogs to like each other more. You're also more likely to be successful if you are companions with the animals (I don't know if you need to be companions with both animals or just the one that you encourage to breed). To become companions you need to get your relationship with the animal up quite high (I'd say 85%+), then it will become an option under the "Friendly" menu.

I'm companions with one of them and almost about the same with the other and it hasn't changed anything but i'll try the be nice option for a while see if that does anything~ thank you cx

I had the same issue. I ended up just going into edit mode and made another dog for my house. I then got them to breed.

I have tried several times to get my cats to breed. Selected "encourage to" I don't know how many times and it's not happening. Anyone else having that same issue? I thought I read it's pretty common.

so far even having them "be nice to" for a while and then try isn't working so I'll probably make a new dog or try my luck with cats or something

For what it's worth, I had to tell one pair of dogs to be nice to each other probably 10+ times over several sim days before they actually mated. I did notice with my other pair though that it only took probably half as many times. I wonder if that had anything to do with the fact that one of them had the friendly trait.

check to make sure that the sims are of opposite genders-sometimes I forgot to change one to female if the other is male