My vet says that "Ascripton" is ok.. it's aspirin coated with Maalox anti-acid to avoid stomach upset. It comes in regular dose of 325mg or extra strength 550mg. Tylonel gave Cody an upset stomach. Vet never said a word about blood thinning. THANKS! for bring that up I'm going to call and ask. I forgot this ball incident til now..During ths summer, during a walk, Cody suddenly went under a neighbors front bushes. To make matters worse, they were sitting outside, He emerged with 2 tennis balls that their kids had thrown there! Getting them away from him was impossible, but the sweet neighbors just laughed. I offered to replace the 2 balls but they gave me 2 more to take home. Like giving kids extra cookies at grandmas!