I'm considering putting my guys on Trifexis since I can no longer get Interceptor (thanks Novartis...). Anyone use/used it? I'm concerned about all the reports of vomiting I've read....anyone experience that after administering it? Besides the vomiting itself being a concern, it says you must administer another pill if they start throwing up.....I'm not sure I can afford double-dosing my dogs in that case. Any comments about Trifexis would be helpful - thanks!