How does weebo drink water? From bowl or the dispenser? Does her face get wet frequently? When u dry her face daily, apply whitening powder as well.... If now dun combat n let the stain stay there, soon it will bcome permanent stain....
And if possible, mop floor every day or every 2 days, coz they sort of act like a mop as well with the white n long hair....

Weebo looks so white, clean and prettier! How I wish Autumn can stop whining then she will have no stains
As for the mouth turn yellow, I cant advice much until I know the reason why its happen. Normally the mouth area if always wet, it will turn the white into yellow. So far Autumn's never encounter anything except her stains, Jasmine used to looks like that if you've seen her old photo before and now its get better althou not fully white yet but it doesnt look as yellow/brownish like last time. Reason maybe because I let them drink from water bottle instead of bowl. I dont like the idea of letting them drink from bowl and wet their mouth. It could also because of food. Since I hand feed them when I fed barf and if I fed kibbles I will wipe their mouth after ate. Sometimes the mouth area will turn yellow after their meal, worst if u soak the kibbles.
It's normal when its puppy time. Mostly is because their teething so they will put whatever they can find into their mouth. It's not merely asking for you attention
What you can do is buy some toys for her and always use the toy to re-direct her whenever she took something she's not supposed to. Not to brag but I'm lucky to have maltese who doesn't bite anything ever since she was a puppy but she likes to stole my snacks thou

Be careful with what I bold. If you dont want her to get hurt of simply took anything, buy play pen and she could roam free inside without hurting both her and your house's stuff. I said this because my friend's pom bite some electricity cable at her house while she's not at home and resulted in being electrify until death. So please be careful in setting up a boundaries for a small puppy. Unless your dog already know your house rules, it should be fine letting them roaming freely inside the house.

Nic: It turns out only Autumn is on heat not both but if wrapping her coat before letting her wear the diaper it will looks funny

maltese and shih tzu also high maintenance breed. Both also not easy lah.....
Both prone to skin problem, eye problem, etc.
I own a shih tzu, so I know. 

Just found this tered, my 3-year-old maltese - Babie

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By the way, may I know any of the Maltese lovers here has problem with your dogs' skin? My dog suffers from fur lost, quite severe actually, on off for about a year already. Saw many vets, also not improving. Currently on long term low dose steroids..your advice is very much appreciated.

Not only the legs, it has very bad fur lost over the buttock and legs as she always scratches it, vet said its yeast infection, tried oral pills for many many months, NOT improving at all, then switched meds, also not working, so in the end i prescribed her steroid. (I'm medical doctor, heee), so actually i'm treating the dog myself. Steroids works like magic pills, buy just long term usage will have very bad side effects.

Thank you for recommending me, however I had stopped breeding for quite some time now. I believe Fred, Kinzonu and Hollybelle are great breeders. However, I do have Maltese up for adoption to good homes. I must stress that my intention is to allow more love and attention to my Maltese since I own many of them, so unless I found someone that can provide them MORE love and BETTER care then only I will consider, otherwise I'm more than happy to keep every one of them. If you are a first time dog owner, you wouldn't be considered. I would be very thankful if those dog owners I already know would recommend me a potential great adopter if they encounter any