Am shy now about that which they ingest......I used Comfortis for a while and had several dogs really sick to their stomach after having it. I guess we all find what works ...and if it does, stick with it. Molly In a message dated 11/17/2012 3:25:51 P.M. Central Standard Time, showgsd@xxxxxxx writes: I used to use Sentinel but when it became unavailable for a while, my vet had me switch to Trifexis (VCA makes a generic called ComboGuard). It treats/prevents all stages of flea control along with heartworm, hookworm, roundworm and adult whipworm. It is a monthly tablet which I prefer to putting something directly on the skin. It is safe for puppies/dogs 8 weeks and older. I have been very happy with it and both vets that I use recommend it. ============================================================================ POST is Copyrighted 2012. All material remains the property of the original author and of GSD Communication, Inc. NO REPRODUCTIONS or FORWARDS of any kind are permitted without prior permission of the original author AND of the Showgsd-l Management. ALL RIGHTS RESERVED. Each Author is responsible for the content of his/her post. This group and its administrators are not responsible for the comments or opinions expressed in any post. ALL PERSONS ARE ON NOTICE THAT THE FORWARDING, REPRODUCTION OR USE IN ANY MANNER OF ANY MATERIAL WHICH APPEARS ON SHOWGSD-L WITHOUT THE EXPRESS PERMISSION OF ALL PARTIES TO THE POST AND THE LIST MANAGEMENT IS EXPRESSLY FORBIDDEN, AND IS A VIOLATION OF LAW. VIOLATORS OF THIS PROHIBITION WILL BE PROSECUTED. For assistance, please contact the List Management at admin@xxxxxxxxxxx VISIT OUR WEBSITE - http://showgsd.org SUBSCRIPTION:http://showgsd.org/mail.html NATIONAL BLOG - http://gsdnational.blogspot.com/ ============================================================================