My beloved dog is a 7 year old Pitmation who is as close to a human as she can get very loving and attention craving all the time. Bella is her name she sleeps in bed with me and flea and tick protection are important. I bought the Hartz Ultra Pro at Walmart because she weighs 45 lbs and they had a dose that seemed to better fit her weight. I had read a little bit about Hartz not being good but had also read some who said to use nothing else.. Within 20 hours of putting the Hartz on Bella she became violently ill. She vomited and had diarrhea for 2 days. She was dry heaving and so pitiful it absolutely broke my heart. I sat up with her all night debating on going to the ER Vet with her but after talking to her Vet I was told to just monitor. Bella has epilepsy so taking her to the vet causes her to have seizures so I was in a real dilemma as to take her or not. After a couple days I began giving her the chicken and rice along with Gatorade mixed with water. She is back to her normal self now but it almost time for her to have another monthly dose. While shopping around for Frontline I found this website and felt a calling to post my concern.