Water additive for Shih Tzu and Chihuahua

A Shih Tzu and a Chihuahua sharing a water bowl — that's actually a really common setup, and wanting one dental product that works for both makes complete sense. Small breeds like yours are disproportionately prone to dental disease. Both Shih Tzus and Chihuahuas have teeth crowded into smaller jaws than nature really intended, which accelerates tartar build-up and gum disease faster than most owners realise. Dental disease is also one of the most common causes of chronic pain in dogs that gets missed entirely — they just quietly suffer through it. Before I point you toward something specific: has a vet flagged dental concerns for either dog, and will either of them actually tolerate tooth brushing?

That's really useful to know — and honestly, you're not alone on the brushing front. Most small dog owners find it a battle, especially with Chihuahuas who tend to be particular about their mouths. The good news is that a water additive is a genuinely effective daily option when brushing isn't happening. Since your Chihuahua already has early tartar flagged by the vet, you want something that's doing real work rather than just freshening breath. Can I ask — do they share the same water bowl, or do they drink separately?

Perfect, that actually makes this simpler. My recommendation is TropiClean Fresh Breath Water Additive. It's the one I'd point you to here for a few clear reasons. The active ingredient is green tea leaf extract, which has solid evidence behind it for reducing plaque and bacteria — this isn't just a flavouring, it's genuinely antimicrobial. It's tasteless and odourless, which matters enormously with small dogs who will simply stop drinking if they detect something off. It's also safe for both dogs at any age, so your 3-year-old Shih Tzu and 7-year-old Chihuahua can share that bowl with no issue. You just add a capful to fresh water daily. For your Chihuahua specifically, given the early tartar your vet noted, I'd also tell your vet you're using it at the next visit — it won't replace a professional clean if one is needed, but it's genuinely the best passive daily maintenance you can do when brushing is off the table.

Yes, it's widely available on Amazon UK — usually well-stocked and eligible for Prime delivery. It comes in a 473ml bottle which lasts a long time given the small daily dose. One thing worth knowing: stick to the plain Fresh Breath formula rather than any of the flavoured variants. Plain is the safest bet for fussy small dogs and means you won't risk either of them going off the water.

You're doing the right thing. Consistent daily use is what makes the difference — it's one of those products that works quietly in the background. Given your Chihuahua's age and the early tartar, I'd still keep an eye on his breath and gum colour, and if the vet suggests a professional scale and polish at the next visit, it's worth saying yes. That combined with the daily additive is the strongest routine you can build without brushing. Good luck with them both.