Not sure what you are seeing to make you think you have TMV, but the seedlings look just fine to me and certainly not suffering from TMV.
Young plants can often have "funny" leaves at first, but once established, they usually turn out ok.
If you are growing in coco, you may want to add a cal/mag supplement.
They will also need transplanting very soon, those small pots will be limiting their growth.
Not sure what you mean by the "dog technique".
Start a diary, the more information you provide, the better the answers to any questions can be.