My late dog Maggie (17 years) always howled along when I played the C accordion. Love Bridge Waltz in G really made her sing. It was amazing. The other keys never got the same response. But whenever I pulled out that C and hit a note, there she was ready to sing.
Some years ago, I hosted a jam at our house. A harmonica player showed up to play. When he took a solo, our Airedale Glenn sat down right in front of Dave and let loose with a deep hooooooowl. Dave stopped, looked at Glenn and said "I'm not that bad"...the rest of us just busted up laughing. Something I'll always remember. I loved that dog and always thought that Glenn was a good judge of character and perhaps musical talent as well. In all fairness, the harp player has gotten a lot better in recent years.
i'm fairly certain my 6 year old dog hates it. i'm not that bad of a player (nor that great) but i can pretend to play by pushing and pulling with the air button only and he goes ape sh*t (mostly barking but will howl too) because he knows it's coming. although if i tell him to stop a few times he will but that doesn't mean he likes it. who knows.