I got this from Vetinfo4dogs.com. It says coated aspirin is not recommended. I have Bufferin on had in case mine ever need a bit of aspirin.

Aspirin Dosage

Q: Thanks for the info . The dog is stiff but does not appear to be in pain, esp when the doorbell rings. What dose of aspirin is best and is enteric coated of any value in dogs? I have him on 325mg/day right now . Steve

A: Steve- I use 10mg/lb. of body weight twice a day for aspirin. Enteric coated aspirin is not recommended in dogs because about half the time the coating isn't digested and the aspirin is excreted whole in the stool.

Hope that helps!