Aologies for length great info form Nutritionist Marc Ching
Buster was having issues with chewing on his paws, hindquarters and rubbing his face. I also thought his belly looked pink. So we had a consultation with Marc Ching, from his LinkedIn page,” I am a veterinarian nutritional consultant whom works with dozens of vets, and a Canine and Feline macrobiologist pet food cooking instructor. I work with special needs cases, and specialize in dogs and cats suffering from major skin ailments and issues like Yeast and Dermatitis.” He is also a 4th generation Japanese herbalist.
It turns out Buster has fungus even though I thought I was feeding him a good diet, good supplements,and  healthy treats instead I was feeding his fungus. I would like to pass the information I learned in case your Yorkie has these issues. This is for Yorkies with itching to help resolve the fungus problem. Other problems may be food allergies which need to be handled differently. You can always go to the Petstraunt site as there is an area to ask questions. 
Holistic and Wellness Healing, Dog Food Allergy Consultation | ThePetStaurant.com 
We went through all the food, supplements, and treats I fed Buster and I learned what ingedients were feeding his fungus. 
For Kibble I had originally feed Orijen which he said was too high in protein for Yorkies and that a good protein range is 24% - 30%. I also fed other premeium brands Now, Artemis , Annamet etc. They were grain free but they contained potato and/or tapioca which he said fed the yeast. He recommend for Buster Amicus Small Breed which uses lentils, he also recommended Nutrisco and Zignature brands of kibble. He had not heard of Canine Caviar but I showed him the ingredients and he was interested in the kibble and said it was good. He did want me to wait to feed the Canine Caviar until after we had the fungus under control because of the garbanzo beans. 
I asked about vegetables and fillers for home cooked and treats. He recommended lentils red or green, and blueberries. From my list his was good with green beans, stringless sugar snap peas, broccoli, celery, cucumbers, romaine lettuce, kale & spinach (not too much can cause stones), plain yourt, cottage cheese. He did not recommend carrots, potatoes, sweet potatoes, apples and pumpkin for dogs with fungus issues. He put question marks next to garbanzo beans and Quinoa.
I failed with treats so much of what I fed fed the fungus. The ingedients that fed the fungus were potato, tapioca, wheat flour, ground barley, malted barley, oats, rice basically all flour, grain etc. I also fed sugars sorbitol, molasses, glycerine, dextrose, and honey. Brewers yeast, nutrional yeast, whey protein (cancerous) all feed the fungus. 
For the treats he did recommend he said to look for one’s that are basically one meat ingredient. He suggested Primal liver munchies, most Primal treats but not the ones with honey. Stella and Chewy’s Carnivore Crunch,and Wholelife freeze dried chicken. Buster’s doesn’t like the flakey texture. We did get and Buster LOVES Bixby Jerky, Chicken Breast slices from EandFPetsupplies.com and Honest Kitchen Beams which are pure icelandic catfish skin stick. Like a bully that smells like fish. He okayed the Moo free range bullies I give to Buster
For supplements he recommended a  different probiotic as he said the one I was using did not have enough probiotic bacteria and recommended Dr Mercola’s Complete Probiotic (human not animal formula) They are capsules and he recommends I feed 1/2 morn, 1/2 night with food. He also recommended Transformation Digestzyme capsules one capsule with every meal. I open capsule and pour over food. I add this to Marc’s food from the Petstraunt and he is emailing me reicpes as I want to learn to homecook. I add these to his Amicus kibble because Buster likes the crunch. Marc prefers his food, or home cooked over kibble but understands convenience and dog's and owners preferences. 
He said to add 1/2 tsp of cocoanut oil and if he will eat it 1/2 tsp of apple cider vinegar to each meal as it is an antifungal and will regulate the ph. 
He recommends the Flying Basset Colostrum powder 1/4 tsp a day which I give to Buster. He approved the Icelandpure Salmon Oil, Animal Essentials Ocean Kelp, RX Vitamins for Pets Bio C, and Cosequin DS that I give to Buster all ready.Sorry I am one of those Yorkie mommies.
 My apologies for the length of this post. But I just wanted to share his information. After my consult he was holding a seminar on Nutrition for Veternarians.He was also a super nice guy.
OH PS !! CET Toothpaste not only has sugar.
In my research I realized the CET Toothpaste I was brushing Buster’s teeth with that 4 of the 5 ingredients are toxic in large quantities to rats and rabbits. From their own brochure
2. HAZARDS IDENTIFICATION 
Emergency Overview 
CAUTION! 
Keep out of reach of children. 
Read entire label before each use.  
3. COMPOSITION/INFORMATION ON INGREDIENTS 
Component Name CAS Number Concentration 
Sorbitol 50-70-4 30 - 50% 
Amorphous Silicon Dioxide 7631-86-9 1 -  10% 
Glycerine 56-81-5 1 - 10% 
Dicalcium Phosphate Anhydrous 7757-93-9 10 -  20% 
Titanium Dioxide 13463-67-7 0.1 - <1.0%   
11. TOXICOLOGICAL INFORMATION
See product packaging for additional information
Acute Toxicity
Sorbitol: Oral LD50 (rat) 15,900 mg/kg
Glycerine: Oral LD50 (Rat) 12,600 mg/kg
 Amorphous Silicon Dioxide Oral: LD50 (rat) > 5000 mg/kg.
Dermal LD50 (rabbit) >5000 mg/kg
Dicalcium Phosphate Anhydrous: Oral LD50 9rat) > 10,000 mg/kg Dermal LD50 (rabbit) > 7,940 mg/kg 
Revision Date: March 30, 2011 
I know toxicity is in large quantities but I don’t  like the idea of brushing Buster’s teeth every day with toothpaste that is toxic both orally and dermal (skin) to rats and rabbit test subjects. 
Marc recommends Baking Soda to brush Buster's teeth with. 
Whew 

  Now Buster and I are going for a walk!