No, the Humane Society of the US (HSUS) is different from the SPCA. I was under the impression that although based in the states, the HSUS had branches in Canada as well; perhaps not. Check out their website (I posted the link above)

If the dog goes to the SPCA, there is a good chance that it will go to a kill shelter. If there is an animal control officer your friend can call, I would suggest she call her/him first. Honestly, if I felt the dog was truly being mistreated, if speaking with the family lead no where, I would call the SPCA. If they decide the dog is being neglected, they will take it to a shelter. I would find out to which shelter he was taken, THEN, go to that shelter and apply to adopt the dog. It's a very difficult decision to make and you're not alone in your anguish. Others here on Pet Talk have faced these very same, difficult decisions. I for one, could not in good conscience, allow that dog to be treated in that manner without doing all I could to recitify the situation. I know it's hard. You have to live "with" these people. I give great credit to you and your friend for your concern and valiant ttempts to help this poor pup Please keep us updated. Sandra