Hello!
This isn't so much a "problem" as it is a preventative inquiry.
We have an 8 month old maltese named Wickett who is VERY tiny at only 3.4lbs...and probably isn't getting any bigger. We just recently adopted an almost 4 month old lab mix named Trouble who grows every day...She's already literally 5 times Wickett's size.
So far they get along very well. Wickett is dominant, and really let's that be known, and Trouble is very easy going - you could bite her while she's eating and she'd just turn to lick you. The only issue, other than the playing, we have is they both steal from each other CONSTANTLY...but never with any anger...more like "stealth" stealing.
We're trying to get a jump on the size difference by putting a stop to rough play from the get go, but we also don't want to inhibit them and keep them from enjoying each other. So far they play REALLY well inside. They wrestle from time to time, but it's usually Wickett on top of her, with her on her back. There's some bite play, but it can't be very rough because Wickett never cries out or stops playing.
My area of "concern" is when they are outside. Our yard is not fenced yet, so at the moment we go outside on leashes but my parents have a farm and they get to run around there without leashes...Wickett wants SO badly to really really play, so he starts running and Trouble chases him, but every once in a while she catches up to him and they do a tumble together, which once she gets bigger could prove to be fatal to him. I can't let it continue and I'm willing to keep them separated or keep Trouble leashed so that he can run and she can't reach him...but once we have our yard fenced in a couple weeks it would be really wonderful to let them out to play. As it is...even if they're on leashes if they get a little playful she wants to chase and tackle in our yard, so it may come down to having to let them out to use the "facilities" separately too.
Does anyone have experience with vastly mismatched sized dogs?? Or training dogs how to play gently?
As I mentioned, inside it's a little different, there's no chasing involved and she typically lies down or gets on her back so that they play on his terms. And if he ever gets a little frustrated and yelps, she HITS the deck and puts her head down as if to say "I'm sorry!"
We don't allow her to jump on ANYTHING and all of their interaction is closely watched so she doesn't get a chance to get to rough. We also keep him from antagonizing her (which he likes to do...he's really interested in everything she does, in a "hey this is my house." sort of way) but even if she has a really tasty treat and is on her bed, he can come up and put his face right up to hers and she doesn't even seem to notice.
Anyhow, sorry so long, but if anyone has a similar situation it would be awesome to hear from you even to know that we're not the only crazies out there with a tiny and a huge dog at the same time.
Thanks!