You all are too funny; (some of you are too graphic)!
Again, I really don't see any reason why most animals won't be with us in Heaven. They are there for our enjoyment so why not? We just don't know which ones will be there. (Fleas, ticks, fly's and mosquitos have no purpose in life but to aggravate us so I'm sure they won't make it to Heaven) IMHO.
Also, God can get animals into Heaven without the regular earthly qualifications. Animals do not have these free will choices. How & if they get there is by God's choosing. It has nothing to do with the animals "accepting Jesus". (That was funny Vrai)
Next, there is clearly no indication that we will ever "go to the bathroom" in Heaven. Nor will any of the animals. I believe that we will not need to eat to survive there but that we can, if we want, for the enjoyment. I also see no indication that, after we eat there, we will need to remove waste from our bodies. The same will go for the animals.