How big do boxer mix dogs get and when are they fully grown?

It's impossible to know what the pups will look like as adults. It depends on what the father looked like as well as how dominant his traits are vs moms. That said many mixes will closely resemble one purebred parent. You'll just have to wait and see to find out.

It depends on Zeus's age. Typically dogs reach the full growth between one year to 18 months of age (large and giant breeds of dogs take longer to reach their full growth). If he's still young, he will have more growing to do. I hope this helps :-)

Based on the mix of breeds you said I would suspect that Gracie has done the majority of her growth already. You might see some very small amounts of growth until 18 months of age but for the most part she will hopefully remain that size forever.

Atlas is a very handsome boy, congrats on your new dog! At seven months old, he will be getting close to his full size, and while he will grow some more (dogs typically reach adult size between one year to 18 months of age), he won't double in size from where he is currently. I would expect a little more growth from him but not a massive change in size or weight :-)

Chico is such a handsome boy! He looks like a Pitbull and males can be around 35-60 pounds when fully grown. He still has a bit of growing to do, and he may be mixed with another breed of dog leading to his smaller size. Plus he is the runt, so they do tend to be smaller. I hope this helps!

At 13 months of age, Yoda may grow just a bit more, but he is mostly done growing. Some dogs are just smaller in stature than others, regardless of having the same genetic background. It is unusual that Yoda (being a male) is smaller than his sister, but genes can do crazy things. Sixty pounds of muscle is still a pretty big dog! :-)

Unfortunately that's hard to know exactly because he is a mixed breed. Mixed dogs can some grow larger than either parent. In general, small breed puppies reach adult height around 6-8 months of age so I suspect (as a guess) he may only grown another inch or two. He will gain weight and fill out until about 8-10 months of age. I suspect he may end up around 9-10lbs. This will depend though on which parent he takes after. Maltese tend to be light boned and thin where as Shih Tzu's tend to be heavier boned and have a stockier build. Again, know this is all a guess. Sometimes puppies can be late bloomers. Your veterinarian can get a better idea based upon Comet's bone structure. I hope this helps.