It should improve. Kojak was 12 weeks old when I put him in with Jenna who is almost 12 years old. I couldn't always be there to correct behavior, but he's a nice pup and she's a tolerant bitch. Evenso, I provided her with an escape route. If she is tired of him, she can go onto the chair and then onto the counter in the inside portion of their room.
The boy will be six months in a few days. She still sits or lies on her counter sometimes. He's not bitey, but he will hump her occasionally. Nutcase! When I let him play with Quinnie (will be 2 years in October), he grabs and she grabs and they slobber each other's heads -- no aggression in it, but it looks scary. Only both dogs look like they are having the time of their lives.
Kojak will walk over to Babsy (Jenna's litter sister) and she will give him the stink-eye, and lift her lip, and he goes the other way. (Babs is normally kenneled with Quinnie half in and half out of the house). Today I finished a pork stew and put the leftovers back into the pot and put it on the floor, then I let Kojak, Babs, and Quinnie out. Kojak and Babs both had their heads buried in the pot cleaning it out at the same time.
Jenna, RN CGC & Babs, CD RA CGC HIC
Heidi, RA CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear CGC