Frothing

Question
My 3 yr old bitch black lab has within the last 6 months started to froth/foam around the mouth and nose whenever were out whether its walking or running. has anyone experienced this or know the cause and what i should do?

Answer
It really doesn't sound like much.  Has she slowly been putting on weight?  If so, you need to cut back on her food a little, see  http://www.longliveyourdog.com/twoplus/RateYourDog.aspx

It wouldn't hurt to discuss the problem the next time you are at the vet's and also have the vet evaluate her body condition.