You need to try and get rid of the infestation! Last summer I had an infestation of snails and slugs-some of them were huge! It used to creep me out watching them migrating across my patio every night, god knows where they were off too! Luckily enough I never had a problem with my dogs or cats trying to eat them. I used pet-friendly snail pellets but my Dad has used biological products in his garden before, similar things are found
here. You can also find some more advice
here. Ofcourse after they are dead you will need to be vigilant in collecting the remains of the little blighters before the dogs do, but once they're gone, that's it! :)
HTH :)