I've had experience with lots of dogs and I'll be honest. Some of it is simply doggy dna. Some breeds and some dogs in general just smell worse than others. A good shampoo and cleaning regimen goes along way but don't beat yourself up if you're doing all u can. Try adding baking soda to their next bath that will help.

Unfortunately there could be a number of reasons. First I would check around the house and make sure your dog isn't getting into anything they shouldn't. No people food, socks, tissue, paper, plastic, anything, not even scraps or crumbs.

My dog had the same issue and I took her to the vet and it was determined there was nothing seriously wrong but she does simply have a sensitive stomach, she gets car sick and will even vomit from drinking water too fast.

Once you've ruled out a serious intestinal issue I would keep their diet as clean as possible, only high quality pet foods and raw veggies. Let their food digest before going out for intense exercise, you may need to crate him or her for about 30 minutes after a meal or just make sure they lay down. Anything to keep them wrestling about if they are high energy.

Another thing that will help is high quality treats that are veggie based or 100 percent real meat and definitely no rawhide.

I hope your dog is ok and I hope this helps.

Although the swelling and discoloration of the vulva is the first visible symptom of heat, it may not be obvious in all breeds. Many owners do not notice it, so the appearance of vaginal discharge is often regarded as the first sign. The discharge is usually very red and bloody at the beginning of the heat, but it thins out and becomes pinkish or yellow as the cycle progresses.

When dogs are in the first part of their heat cycle, they may become uncomfortable or nervous and easily distracted. They usually show no signs of wanting to breed and generally chase off males that approach them. They may become more clingy or affectionate with their owners.

When she begins to ovulate, the dog generally begins to hold her tail out to the side in a behavior known as flagging. She becomes receptive to male attention at this stage. She may be more prone to wandering, and owners may notice stray males approaching or marking their property. The female dog must be kept away from intact males because she can get pregnant even on her first heat.

Oatmeal based shampoos are really great, dish soap surprisingly as well, and if you make an oatmeal bath mixing the dish soap and oatmeal together you can add an essential oil such as lavender or lemongrass. Summer is approaching and both oils repel insects to keep the bugs away. Plus your dog will smell great! Hope that helped a bit ;)