Was watching my three year old grandson, (Hayden) tonight while DD and SIL went out for dinner. My dogs love him and are very gentle with him. Anyway after about an hour of Hayden climbing and pulling on them, Merlot,( 3 year old choc male) gets bored or tired and goes in the other room and lays down and falls asleep. Hayden plays some more with Zoey,( 3 year old yellow female) for a while and then he goes in the other room and climbs on sleeping Merlot. Merlot doesn't open his eyes, but goes "Grrrr". Not loud, actually kind of soft, but I immediately pulled Hayden off him. My question is, was this Merlot just saying "knock it off kid, I'm trying to sleep" or was he saying "get off me or I will bite you"? Has me concerned as Merlot NEVER growls unless he is playing tug o war. Any dog behavior experts out there?