Yes, Saxet, there were three puppies, all looking somewhat alike. Two males and one female. The adoption people said the litter had been dumped by the roadside, estimated age 7 weeks. I selected the male that I thought was the better-looking. I've had only female dogs for years, and when my husky (alpha dog) died in April, the spaniel moved up to alpha. The Jack Russell is a female also, and very submissive. I think she ranks even below the cats, LOL! I thought a male would integrate more easily into the household and I wouldn't have to fear for my cats' lives (at 8 pounds, he was the size of a cat). He has made friends with the two dogs and two or three of the cats. He adores my 93 year old mom whom I care for full time, but I have to watch that he doesn't chew her shoes or grab her pants leg as she tries to walk around. I don't leave them alone together because she really can't (doesn't) manage him. Of course she thinks he's adorable and lets him do whatever he wants. I keep telling her certain things that are cute when a dog weighs 8 pounds are not so amusing when he weighs 80 lbs.
He now weighs 11 pounds and is developing quite a personality. He's going to be a handful--very strong minded and demanding and into everything. But very loving, bright and trainable, so far, except for housebreaking. He pees outside, he pees inside, all the same-o same-o to him. Usually poops outside, but poops in his crate every night. What a mess in the morning! I admit I don't get up and take him out in the middle of the night. Last outing is usually 11 pm. then 6 am. till he gets out again. Last meal at 5 pm. Seems like he could poop before bedtime, but......nooooooo. Might be a good idea to start a 3 am outing. Ugh. Anyway, I just bought one of those steam floor cleaners so I can sterilize my kitchen floor. Bobby hasn't even seen the rest of the house, and he won't till he learns a few things.
Anyway, he is toeing the line. Rules, boundaries, and limitations, as Cesar Milan would say. When he gets too rambunctious, he goes out in the yard for a break or into his crate so I can have a break. So far he is learning the usual puppy stuff--sit, come, stay, fetch. No leash work yet--will start that as soon as he gets his second set of shots this week, then I'll take him for a little jaunt without the other dogs.
Thanks for your input. I'll keep updating with pix and we'll see what he turns out to be.