Ear infections can cause a foul odor coming from your dog's ears.
If you notice your dog's skin is red, inflamed, or has any sores, it's important to take them to the vet to get a diagnosis and treatment.
If your dog's breath smells like something died, it's time to brush their teeth more often and give them dental treats.
If you've recently changed your dog's diet, and they've started to stink, it's a good idea to switch back to their old food or try a different one.
If you've ruled out all of the other possible causes, and your dog is still stinking, it's a good idea to have them checked by a veterinarian.
As dogs get older, their sense of smell and taste declines. This can lead to them not grooming themselves as well as they used to, which can cause them to stink.
Dogs that don't get enough exercise are more likely to develop skin problems, which can cause them to stink.