Glad you had Daisy tested!
We had Mojo tested for everything when we first got him. He is on interceptor once a month (we get it from the vet) - hope this is a good one (if anyone knows otherwise, please let me know). I have used a believe something called Heartguard (they were chewy chunks) for a Shih-tzu we had once, but the vet recommended Interceptor for Mojo.
Poor Bruno!!! We will keep him in our thoughts and prayers! BTW, we had a lab named Bruno years ago when my daughter was a toddler - she named him from the hound dog on Cinderella! Loved that dog and that name!