I don't know if you can get this in Europe...but
Apple Cider Vinegar (with the Mother, and unpasterized)
is supposed to be helpful in maintaining a balance ph.
http://www.bragg.com/products/applecidervinegar.html
Here are a few sites with information about how it works. They are breif, but read them through and see what you think? This way you will know what you are talking about when you go to the Vet, although, I am sure she has no clue about it...
http://www.earthclinic.com/Pets/acvfordogs.html http://www.hundmeister.com/acvbenefit.htm http://www.organic-dog.com/?action=v...c02f4dd66cb025 http://b-naturals.com/product_info.p...2e48a116e26bb3
Pet Care - Daily Health Tonic
The minerals, enzymes and acids in unpasteurized apple cider vinegar can supplement your pet's existing diet. It can be added either directly to the dog's food or drinking water.
Besides being a good source of easily absorbable potassium, apple cider vinegar aids digestion, inhibits the growth of unfriendly bacteria and helps maintain the proper acid/alkaline balance of the digestive tract.
Many holistic Vets recommend a daily dosage of:
1 tsp (5 ml) for cats and small dogs (up to 14 lb)
2 tsp (10 ml) for medium dogs (15 to 34 lb)
1 tbsp (15 ml) for large dogs (35 to 84 lb)