Thanks Angelbunny,
That's a relief as long as it's not unhealthy for him to have callouses. I was worried it might be something I was feeding (or not feeding) him, or some type of bug bite, or an allergy.
Guess I'm just a paranoid, overprotective rottie mom who worries about every little thing.
Maybe this winter he'll prefer carpet and blankets for a few months (but judging from last winter, I doubt it.
)
Cricket