I have two schnoodle dogs, one who is 18 mos and one who is 13 mos. They get along great, although they do play a lot... and during their play there is a lot of growling/curling of lips/mouthing but never any injuries or what appears to be fighting (i.e., it just looks bad).
The problem is with my youngest, Sydney. we got him from a breeder (the same breeder as my oldest) when he was approx. 10 weeks. Unfortunately we got him in the winter, so we weren't outdoors as much and the only dog he really socialized with was his sister. a friend of ours brought her dog over a couple times and sydney would just bark and whine the whole time becuase his sister was playing with someone else and he was left out. he did growl and snap at this dog, and this was our first taste of his aggression.
he has also bit people. we consulted a trainer about this and it has gotten slightly better, i.e., he follows commands to sit and stay when people come over and he hasn't bit or acted aggressive to anyone in a while (knock on wood). he HAS growled though...
in the summer i brought him to my parents' house (without his sister) to try to socialize him with their dog, Ginger, who is a 10-yr old beagle-basset hound mix. this did not go over well. my parents' dog would sniff sydney's snout, and sydney would growl and snap at her. this happened constantly thoughout my time there. i had to muzzle him. i should say though, that i went out and left my dad to watch the dogs and he took syd's muzzle off and syd never even peeped at Ginger the whole time i was out.
now christmas is coming, and we want to bring our dogs to my parents' place again. i am terrified. i could use some suggestions...should i take him around some other dogs for short periods of time, using plenty of reinforcement for not snapping/biting? i was planning on bringing him over to my friend's place (she has a large, calm, female spaniel mix) with muzzle on, and see how it goes...i just don't want disaster to strike over christmas!! and i really don't want to leave them at a kennel.