Before consulting an online veterinarian, make sure it's the right thing to do, and that you're getting what you think you're getting.
I've talked about the advantages of free online consultations. Here I'll outline some cautions for using any kind of Web based service.
The ease of being able to consult a vet or cat behavior specialist online is certainly a benefit, and a big attraction.
It can also give you some peace of mind by confirming that you and your vet are headed in the right direction.
But, if you use an online veterinarian, it may be too easy to click that mouse. There are several disadvantages to using an online veterinarian for advice...
The above issues are pretty much common sense, but they make one big assumption, and that is that the online veterinarian in question is qualified to review your case.
So, my biggest caution here is that you make sure that the site you're dealing with actually has real veterinarians (or vet techs, or pet behavior experts, depending upon your needs). Keeping the above in mind while using these Web-based services will help you have a better, more reliable experience.