What are rabies what are symptoms What causes rabies
It can be caused by your dog eating or being bitten by another pet with rabies. It is very dangerous your pet should be vaccinated at a local vet or pet-co etc.
Foaming of the mouth
If you suspect it, go to the vet immediately - many symptoms appear when it is too late (not all, but if it were my dog, that's what I would do)
dry mouth disorientation blurred vision irritability sensitive to light/ sound. it's a virus.
Rabies is a virus .. Refer to this link for a descriptionhttp://www.cdc.gov/rabies/transmission/virus.html
once again if it might have any type of life threatening disease illness virus whatever take it to the Vet...a few hundred dollars is better then a dead dog