Can I use this shower holder on slightly textured wall?
Yes, but not too textured, must be hard wall, still stays best on smooth surface.
Will it fit my shower head/shower hose?
The slot is universal, should fit 99% shower head/shower hose in the market, if you want to be 100% sure, measure you shower hose connector diameter, make sure it is less than 0.92 inch.
How can I adjust it to horizontal angle so I can wash my dogs easily?
Easy, rotate the low part of the holder to the side, and adjust the angle to the lowest, then you will have 90 degree downwards position.
My shower head is larger, will it fits my large shower head or it is strong enough to bear it?
Yes, definitely, this holder was designed to support all handheld shower head, even those large, made of metal, also the slot is slightly bigger to fits most of the shower hose connector.
Can I remove it without damaging my wall?
Yes, it is strong acylics adhesion, use a knife to slowly cut a small gap and spray some warm soap water into it while cutting it further down. it may take 5 mintues, as the adhesive is very strong.